WO2021211825A1

WO2021211825A1 - Articulating exercise attachments

Info

Publication number: WO2021211825A1
Application number: PCT/US2021/027460
Authority: WO
Inventors: Stacy M. LEWIS-DOVE; David M. BONNER
Original assignee: Lewis Dove Stacy M; Bonner David M
Priority date: 2020-04-15
Filing date: 2021-04-15
Publication date: 2021-10-21

Abstract

An attachment for exercising against a resistance comprises, in some embodiments, a spherical base; a positioning apparatus adjustably engaging the spherical base; a plurality of position ports distributed on the spherical base or on the positioning apparatus; at least one retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality of position ports; an extension arm attached to the positioning apparatus or the spherical base; at least one cable guide for routing a weight-transfer cable along the extension arm; and an exercise attachment point on the extension arm distal from the positioning apparatus and the spherical base for receiving a terminus of the weight-transfer cable. An apparatus for exercising against a resistance can include the foregoing attachment, a weight stack, and a cable tensioning reel, for example.

Description

ARTICULATING EXERCISE ATTACHMENTS

Cross-Reference to Related Applications

[0001] This application claims benefit of priority under PCT Chapter I, Article 8, and 35 U.S.C. § 119(e) of U.S. Provisional Patent Application No. 63/010,104 entitled, “ARTICULATING EXERCISE ATTACHMENTS,” filed April 15, 2020, and of U.S. Provisional Patent Application No. 63/072,105 entitled, “ARTICULATING EXERCISE ATTACHMENTS,” filed August 29, 2020, which are both incorporated herein by reference in their entirety.

Copyright Notice

[0002] A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyright rights whatsoever.

Field of Invention

[0003] This invention relates to equipment for exercising against a resistance such as a weight stack.

Background of the Invention

[0004] Equipment for exercising against a variable resistance provided by a weight stack are known. The athlete selects a desired number of weight plates from the weight stack, usually by inserting a pin that engages a rod, and the selected weight plates move when the athlete performs an exercise on the equipment. Typically, the equipment has some adjustability to account for athletes of different sizes. However, that adjustability remains fairly limited. A hand grip can be moved closer or further, for example, to account for shorter or longer arms of various athletes, respectively. Yet the basic exercise remains the same. And the adjustments are often limited to the increments set by the manufacturer of the equipment. If the athlete’s arm has a length most suited to an adjustment between two increments, the athlete must make do with a too-long or too-short adjustment. Moreover, different exercises require different pieces of exercise equipment - each piece is dedicated to a specific exercise or a small number of variant exercises. A curling machine allows bicep curls. A lat pull-down device allows an athlete to exercise latissimus dorsi or triceps. Finally, athletes must accept the exercises designed by the manufacturer of the exercise equipment, as narrowed by the capital budget of the gym operator. If no manufacturer designed a piece of equipment for a given exercise, or if the gym operator could not afford such a piece of equipment, then the athlete must improvise or do without that exercise. What is needed is robust exercise equipment providing a greater range of adjustability, while allowing for the creativity of the athlete to design and execute new exercises. Building on the innovations set forth in International Patent Application No. PCT/US2018/057195, published as WO 2019/199352 on October 17, 2019, which is incorporated herein by reference in its entirety, Applicant has developed a line of attachments and apparatuses that address at least some of the shortcomings of known exercise equipment.

Summary of the Invention

[0005] Certain instances of the present invention provide exercise equipment that can support a virtually infinite array of exercise configurations. [0006] Some embodiments of the present invention relate to attachments for exercising against a resistance, comprising: a spherical base; a positioning apparatus adjustably engaging the spherical base; a plurality of position ports distributed on the spherical base or on the positioning apparatus; at least one retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality of position ports; an extension arm attached to the positioning apparatus or the spherical base; at least one cable guide for routing a weight-transfer cable along the extension arm; and an exercise attachment point on the extension arm distal from the positioning apparatus and the spherical base for receiving a terminus of the weight- transfer cable.

[0007] Other embodiments relate to attachments for exercising against a resistance, comprising: a first spherical base; a first positioning apparatus adjustably engaging the first spherical base; a plurality of first position ports distributed on the first spherical base or on the first positioning apparatus; at least one first retractable positioning pin adapted to secure the first positioning apparatus relative to the first spherical base by selectively interlocking a first position port among the plurality of first position ports; a first extension arm attached to the first positioning apparatus or the first spherical base; at least one first cable guide for routing a weight-transfer cable along the first extension arm; a second spherical base and a second positioning apparatus adjustably engaging the second spherical base; wherein the second spherical base or the second positioning apparatus is attached to the first extension arm distal from the first positioning apparatus and the first spherical base; a plurality of second position ports distributed on the second spherical base or on the second positioning apparatus; at least one second retractable positioning pin adapted to secure the second positioning apparatus relative to the second spherical base by selectively interlocking a second position port among the plurality of second position ports; a second extension arm attached to the second positioning apparatus or the second spherical base, whichever is not attached to the first extension arm; at least one second cable guide for routing the weight-transfer cable along the second extension arm; and an exercise attachment point on the second extension arm distal from the second positioning apparatus and the second spherical base for receiving a terminus of the weight-transfer cable.

[0008] Still other embodiments relate to apparatuses for exercising against a resistance, comprising: a weight-transfer cable; a frame comprising a plurality of vertical members mutually supporting one or more horizontal members; a plurality of cable guides attached to the frame adapted to route the weight- transfer cable about the frame; a cable tensioning reel adapted to receive an excess of the weight transfer cable, the cable tensioning reel positioned on a first vertical member among the plurality of vertical members or the one or more horizontal members; a weight stack comprising one or more weight plates that can be selectively moved when a tension is applied to the weight transfer cable, thereby providing the resistance; an attachment for exercising against the resistance, comprising: a spherical base ; a positioning apparatus adjustably engaging the spherical base; wherein the spherical base or the positioning apparatus is attached to the frame; a plurality of second position ports distributed on the spherical base or on the positioning apparatus; at least one retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality of position ports; an extension arm attached to the positioning apparatus or the spherical base, whichever is not attached to the frame; at least one cable guide for routing the weight-transfer cable along the extension arm; and an exercise attachment point on the extension arm distal from the positioning apparatus and the spherical base for receiving a terminus of the weight- transfer cable. [0009] Still additional embodiments relate to apparatuses for exercising against a resistance, comprising: a weight transfer cable; a frame comprising a plurality of vertical members mutually supporting one or more horizontal members; a cable tensioning reel adapted to receive an excess of the weight transfer cable, the cable tensioning reel positioned on a first vertical member of the plurality of vertical members or the at least one horizontal member; a weight stack comprising one or more weight plates that can be selectively moved when a tension is applied to the weight transfer cable, thereby providing the resistance; an attachment for exercising against the resistance, comprising: a first spherical base ; a first positioning apparatus adjustably engaging the first spherical base; wherein the first spherical base or the first positioning apparatus is attached to the frame; a plurality of first position ports distributed on the first spherical base or the first positioning apparatus; at least one first retractable positioning pin adapted to secure the first positioning apparatus relative to the first spherical base by selectively interlocking a first position port among the plurality of first position ports; a first extension arm attached to the first positioning apparatus or the first spherical base, whichever is not attached to frame; at least one first cable guide for routing the weight-transfer cable along the first extension arm; and a second spherical base anda second positioning apparatus adjustably engaging the second spherical base; wherein the second spherical base or the second positioning apparatus is attached to the first extension arm distal from the first positioning apparatus and the first spherical base; a plurality of second position ports distributed on the second spherical base or on the second positioning apparatus; at least one second retractable positioning pin adapted to secure the second positioning apparatus relative to the second spherical base by selectively interlocking a second position port among the plurality of second position ports; a second extension arm attached to the second positioning apparatus or the second spherical base, whichever is not attached to the first extension arm; at least one second cable guide for routing the weight-transfer cable along the second extension arm; and an exercise attachment point on the second extension arm distal from the second positioning apparatus and the second spherical base for receiving a terminus of the weight-transfer cable.

[0010] Further embodiments relate to methods of configuring an apparatus for exercising against a resistance, one such method comprising: obtaining any of the apparatuses as disclosed herein; positioning the positioning apparatus relative to the spherical base; and selectively interlocking a position port with the at least one retractable positioning pin, securing the positioning apparatus relative to the spherical base, thereby configuring the apparatus for exercising against the resistance.

[0011] Still further embodiments relate to methods of configuring an apparatus for exercising against a resistance, one such method comprising: obtaining any of the apparatuses disclosed herein; positioning the first positioning apparatus relative to the first spherical base; selectively interlocking a first position port with the at least one first retractable positioning pin, securing the first positioning apparatus relative to the first spherical base; and positioning the second positioning apparatus relative to the second spherical base; selectively interlocking a second position port with the at least one second retractable positioning pin, securing the second positioning apparatus relative to the second spherical base, thereby configuring the apparatus for exercising against the resistance. [0012] While the disclosure provides certain specific embodiments, the invention is not limited to those embodiments. A person of ordinary skill will appreciate from the description herein that modifications can be made to the described embodiments and therefore that the specification is broader in scope than the described embodiments. All examples are therefore non limiting.

Brief Description of the Drawings

[0013] Fig. 1 depicts one embodiment of the invention comprising apparatus 101 for exercising against a resistance.

[0014] Fig. 2 depicts another embodiment comprising attachment 203 for exercising against a resistance.

[0015] Fig. 3 depicts cable guide 340.

[0016] Figs. 4 and 5 depict cable guide 440.

[0017] Fig. 6 provides a perspective view of cable tensioning reel 602.

[0018] Fig. 7 provides a perspective view of cable tensioning reel 702.

[0019] Fig. 8 depicts spherical base 810 in an elevation view. In Fig. 9, positioning apparatus 820 also appears.

[0020] Fig. 10 shows spherical base 1010 in a right side elevation view. [0021] Fig. 11 depicts spherical base 1110 in a right side elevation view.

[0022] Fig. 12 provides a perspective view of a portion of extension arm 1230 with first cable guide 1241 and second cable guide 1242.

[0023] Fig. 13 depicts a portion of attachment 1303.

[0024] Fig. 14 depicts attachment 1403.

[0025] Fig. 15 depicts attachment 1503.

[0026] Fig. 16 depicts attachment 1603.

Detailed Description

[0027] As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention that may be embodied in various forms. The figures are not necessarily to scale, and some features may be exaggerated to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention.

[0028] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as is commonly understood by one of ordinary skill in the art to which this disclosure belongs. In the event that there is a plurality of definitions for a term herein, those in this disclosure prevail unless stated otherwise.

[0029] Wherever the phrase “for example,” “such as,” “including” and the like are used herein, the phrase “and without limitation” is understood to follow unless explicitly stated otherwise. Similarly “an example,” “exemplary” and the like are understood to be non-limiting.

[0030] The term “substantially” allows for deviations from the descriptor that don’t negatively impact the intended purpose. Descriptive terms are understood to be modified by the term “substantially” even if the word “substantially” is not explicitly recited.

[0031] The term “about” when used in connection with a numerical value refers to the actual given value, and to the approximation to such given value that would reasonably be inferred by one of ordinary skill in the art, including approximations due to the experimental and or measurement conditions for such given value.

[0032] The terms “comprising” and “including” and “having” and “involving” (and similarly “comprises”, “includes,” “has,” and “involves”) and the like are used interchangeably and have the same meaning. Specifically, each of the terms is defined consistent with the common United States patent law definition of “comprising” and is therefore interpreted to be an open term meaning “at least the following,” and is also interpreted not to exclude additional features, limitations, aspects, etc. Thus, for example, “a device having components a, b, and c” means that the device includes at least components a, b and c. Similarly, the phrase: “a method involving steps a, b, and c” means that the method includes at least steps a, b, and c. [0033] Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”. [0034] Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field.

[0035] It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.

[0036] Some embodiments of the present invention afford an almost- infinite array of exercise options, allowing the positioning of an exercise attachment point virtually wherever the athlete desires. Then, the weight- transfer cable routed through suitable cable guides connects the exercise attachment point to a weight stack, offering a wide selection of resistance at the exercise attachment point. Attachments according to the present invention can include any number of spherical bases, positioning apparatuses, and extension arms in sequence. One, two, three, four, five, or six such sequences can be used, for example. A cable tensioning reel adapted to receive an excess of the weight-transfer cable allows the right amount of tension in the cable so that there is little or no slack when the exercise begins. Another embodiment, therefore, comprises a positioning apparatus and an extension arm attached to the positioning apparatus. Still another embodiment provides a positioning apparatus and an extension arm attached to the positioning apparatus, and a spherical base attached to the extension arm distal from the positioning apparatus - to engage another attachment. Optionally, one or more branches also can be employed, wherein for example two extension arms branch from a single spherical base or from a single extension arm having two spherical bases. In yet other embodiments, spherical bases, positioning apparatuses, and extension arms can be configured in any desired manner. For example, an extension arm can attach to two positioning apparatuses, which together with appropriately- positioned squeeze mechanisms, can allow for facile re-positioning of the extension arm. See Fig. 14, for example.

[0037] As stated herein, some embodiments of the present invention relate to an attachment for exercising against a resistance, comprising: a spherical base; a positioning apparatus adjustably engaging the spherical base; a plurality of position ports distributed on the spherical base or on the positioning apparatus; at least one retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality of position ports; an extension arm attached to the positioning apparatus or the spherical base; at least one cable guide for routing a weight-transfer cable along the extension arm; and an exercise attachment point on the extension arm distal from the positioning apparatus and the spherical base for receiving a terminus of the weight- transfer cable.

[0038] The spherical base can be any suitable shape. For example, the spherical base can take the form of a complete sphere or a partial sphere. A partial sphere, such as a hemisphere, limits the positions that an extension arm can adopt relative to the spherical base. However, mounting hardware such as a mounting post and the frame of the apparatus upon which the attachment is mounted also will limit the positions that the extension arm can adopt relative to the spherical base. In some instances of the present invention, the spherical base has a number of holes called position ports distributed on the spherical base that allow for the secure positioning of the extension arm. In other instances, the spherical base includes at least one retractable positioning pin that allows for the secure positioning of the extension arm. The extension arm may be attached to the spherical base or the positioning apparatus. Furthermore, the spherical base can comprise any suitable materials. In some cases, the spherical base comprises a spherical base metal surface. The spherical base metal surface can include steel, aluminum, titanium, and combinations thereof. To increase the lubricity of the spherical base, the spherical base can include a spherical base polymer layer over the spherical base metal surface. In other alternatives, the spherical base is made from a structural polymer strong enough to withstand the forces resulting from exercising against a resistance. Accordingly, the spherical base and/or the spherical base polymer layer comprises poly(tetrafluoroethylene), nylon, high density polyethylene, polypropylene, or a combination thereof. Any suitable hardware can be used to mount the spherical base in any desired manner. In some cases, the spherical base further comprises a mounting post adapted to engage a frame of an apparatus for exercising against a resistance. In other cases, the spherical base further comprises a mounting post receiver adapted to receive a frame mounting post to engage a frame of an apparatus for exercising against a resistance. A mounting post or a frame mounting post can include a mechanism to secure engagement, such as, for example, a spring-loaded retractable pin. In still other cases, as mentioned above, the spherical base can be attached to the extension arm. In such cases, a mounting post or mounting post receiver may be attached to the positioning apparatus.

[0039] A positioning apparatus fits over the spherical base, and can be moved over the spherical base so that the extension arm can adopt many different positions. The positioning apparatus may contain a retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port on the spherical base. Alternatively, the retractable positioning pin is located on the spherical base, and the positioning apparatus comprises a number of holes called position ports. Accordingly, an operator can disengage the retractable positioning pin, move the positioning apparatus over the spherical base to a new desired position, and allow the retractable positioning pin to engage a position port, thereby locking the positioning apparatus in place. This can be called “securing the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality position ports.” In some cases, the positioning apparatus has a shape that is partially spherical, and/or comprises a number of “claws” that engage the spherical base. A plurality of retractable positioning pins can secure the positioning apparatus to the spherical base in some instances. Further instances provide a positioning apparatus that has a dimension greater than the diameter of the spherical base. “Having a dimension greater than the diameter of the spherical base” means that a diameter can be imagined in the spherical base that contacts two points of the positioning apparatus. When that happens, the positioning apparatus will be movable over the spherical base, but should not easily separate from the spherical base because, in a sense, the positioning apparatus “grabs” the spherical base. In some cases, the positioning apparatus further comprises a mounting post adapted to engage a frame of an apparatus for exercising against a resistance. In other cases, the positioning apparatus further comprises a mounting post receiver adapted to receive a frame mounting post to engage a frame of an apparatus for exercising against a resistance. In still other cases, as mentioned above, the positioning apparatus can be attached to the extension arm.

[0040] The positioning apparatus can include any suitable materials. In some cases, the positioning apparatus comprises a positioning apparatus metal surface. In further cases, the positioning apparatus further comprises a positioning apparatus polymer layer over the positioning apparatus metal surface. In still other cases the positioning apparatus is made of a structural polymer. As mentioned above, suitable materials for the positioning apparatus include, but are not limited to, steel, aluminum, titanium, poly(tetrafluoroethylene), nylon, high density polyethylene, polypropylene, and combinations thereof.

[0041] The extension arm provides distance from the positioning apparatus and the spherical base for an exercise attachment point, and also provides structural strength for supporting an exercise against a resistance. Suitable materials for the extension arm include metal and structural polymers, including steel, aluminum, titanium, poly(tetrafluoroethylene), nylon, high density polyethylene, polypropylene, and combinations thereof.

[0042] The attachment includes at least one cable guide routing a weight-transfer cable along the extension arm. The weight-transfer cable ultimately connects the athlete performing an exercise with a weight stack. Guiding the weight-transfer cable along the attachment is at least one cable guide. In some cases, more than one cable guide is needed. A cable guide can be a simple structure with no moving parts, such as, for example, an eye- bolt through which the weight-transfer cable passes. In other cases, a cable guide is a bearing race or a pulley wheel. A bearing race comprises a plurality of ball bearings, cylinder bearings, or a combination thereof, optionally arranged in a circle through which the weight-transfer cable passes. Sometimes, a pulley assembly can be used as a cable guide. A pulley assembly can include a plurality of pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of pulley wheels. At the center of the annulus defined by the plurality of pulley wheels, the weight- transfer cable traverses back and forth nearly without friction, supported by one or more of those pulley wheels. As can be appreciated, because the attachment can be securely placed into a great number of positions afforded by the plurality of position ports distributed on the spherical base, the weight- transfer cable can approach the extension arm from a wide variety of directions. A pulley assembly guides the weight-transfer cable no matter the direction the cable adopts. Any number of pulley wheels can be used, such as, for example, three, four, five, six, seven, or eight pulley wheels arranged annularly in a pulley assembly. Those pulley wheels can have any suitable angle between them. In some cases, the angles of arrangement between the pulley wheels are substantially the same. Accordingly, if there are four pulley wheels, those pulley wheels will be arranged at 90° relative to each other. [0043] In some cases, the at least one cable guide for routing a weight- transfer cable along the extension arm can be a bearing race that receives and guides the weight-transfer cable along the extension arm. In other cases, a plurality of bearing races guides the weight-transfer cable along the attachment. One suitable bearing race is an annular assembly of ball bearings, for example. Optionally, the cable guide can be slidably adjusted along the extension arm.

[0044] Some embodiments of the present invention provide a cable guide that comprises a dual pulley assembly, the dual pulley assembly comprising a plurality of first pulley wheels arranged annularly to maintain the weigh t-transfer cable within the plurality of first pulley wheels; and a plurality of second pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of second pulley wheels.

[0045] Cable guides can be located in any suitable location. Cable guides can be secured permanently and without any ability to adjust them, or they can be adjustable or even removable. Frame members, extension arms, spherical bases, positioning apparatuses all can host cable guides.

[0046] The exercise attachment point can include any suitable features. This is where exercise equipment attaches to the weight-transfer cable so a person can perform an exercise. In some cases, the exercise attachment point comprises a double pulley. Between the double pulley passes the weight-transfer cable, which can then connect to an exercise engagement device like a hand grip. If desired, the terminus of the weight-transfer cable comprises a cable stop and a clip adapted to engage an exercise engagement device. A cable stop is any suitable piece that keeps the cable from retracting or falling out of the exercise attachment point. Any suitable exercise engagement device can be used. In certain instances, the exercise engagement device comprises a hand grip, an ankle strap, a torso strap, a head strap, another kind of strap, an elastic band, a barbell, or a dumbbell. [0047] As stated before, any number of “bones” comprising a spherical base, a positioning apparatus, and an extension arm can be attached in sequence to create a “multi-boned” attachment. Each positioning apparatus can then be situated on each spherical base ultimately to place an exercise attachment point virtually wherever desired. Each “bone” of the multi-boned attachment and the components thereof can be described as set forth for the attachment in the paragraphs above. In one embodiment, an attachment with two “bones” can be described as follows: The attachment comprises a first spherical base comprising a plurality of first position ports distributed on the first spherical base; a first positioning apparatus adjustably engaging the first spherical base; at least one first retractable positioning pin adapted to secure the first positioning apparatus relative to the first spherical base by selectively interlocking a first position port among the plurality of first position ports; a first extension arm attached to the first positioning apparatus; at least one first cable guide for routing a weigh t-transfer cable along the first extension arm; a second spherical base attached to the first extension arm distal from the first positioning apparatus and comprising a plurality of second position ports distributed on the second spherical base; a second positioning apparatus adjustably engaging the second spherical base; at least one second retractable positioning pin adapted to secure the second positioning apparatus relative to the second spherical base by selectively interlocking a second position port among the plurality of second position ports; a second extension arm attached to the second positioning apparatus; at least one second cable guide for routing the weigh t-transfer cable along the second extension arm; and an exercise attachment point on the second extension arm distal from the second positioning apparatus for receiving a terminus of the weight-transfer cable.

[0048] Certain embodiments of the present invention relate to an apparatus including a weight stack. In some cases, the attachments described above can be mounted on conventional or existing universal gyms and similar equipment to form an apparatus of the present invention. In other cases, an apparatus can be designed and built specifically to take advantage of the versatility afforded by the attachments described herein. One or more attachments, each independently having one or more “bones,” can form part of an apparatus that has one or more weight stacks providing a resistance.

As can be appreciated, a weight stack is not the only possible source of resistance. Flexible bows, elastic bands, springs and the like also can be used in place of or in addition to a weight stack. Specific instances of the present invention include a cable tensioning reel that allows more or less weight-transfer cable to come into play in the apparatus. How much weight- transfer cable is needed for a given exercise depends, among other things, on the configuration of the bones of the attachment. Some configurations of the attachment will use less cable, while other configurations will require more. [0049] Accordingly, some embodiments of the present invention include an apparatus for exercising against a resistance, comprising a weight-transfer cable; a frame comprising a plurality of vertical members mutually supporting one or more horizontal members; a plurality of pulleys attached to the frame adapted to route the weight-transfer cable about the frame; a cable tensioning reel adapted to receive an excess of the weight transfer cable, the cable tensioning reel positioned on a first vertical member among the plurality of vertical members or the one or more horizontal members; a weight stack comprising one or more weight plates that can be selectively moved when a tension is applied to the weight transfer cable, thereby providing the resistance; an attachment for exercising against the resistance, comprising: a spherical base and a positioning apparatus adjustably engaging the spherical base; either the spherical base or the positioning apparatus is attached to the frame, such as to a second vertical member in the plurality of vertical members or the at least one horizontal member; a plurality of position ports distributed on the spherical base or the positioning apparatus; at least one retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality of position ports; an extension arm attached to the positioning apparatus or the spherical base, whichever is not attached to the frame; at least one cable guide for routing the weight-transfer cable along the extension arm; and an exercise attachment point on the extension arm distal from the positioning apparatus for receiving a terminus of the weight-transfer cable. [0050] The frame of the apparatus can be any suitable frame. In some cases, metal tubing can be used for the frame elements. In some cases, the cable tensioning reel is removably and adjustably attached to the first vertical member. That means that the cable tensioning reel can be slid along the vertical member, and secured in any desired position with a retractable pin, for example. Also, the cable tensioning reel could be removed from the first vertical member and attached to a different member of the frame. The cable tensioning reel can include any suitable components. In some cases, the cable tensioning reel comprises a spool for winding a portion of the weight- transfer cable; a spool position plate that rotates with the spool comprising a plurality of spool position ports; and a spool-locking plate for selectively locking the spool by selectively engaging a spool position port among the plurality of spool position ports with a retractable spool position pin. In further instances, the cable tensioning reel further comprises a coil spring adapted to turn the spool to take up the excess of the weight-transfer cable.

[0051] In addition, the attachments can include any suitable number of “bones” in the apparatuses of the present invention. Each bone includes a spherical base, a positioning apparatus, and an extension arm, in some cases. In other cases, a bone may include two positioning apparatuses or two spherical bases. One or more of those extension arms includes an exercise attachment point, such as a single pulley or double pulley. One or more of those bones includes one or more spherical bases for more bones. If an attachment includes two or more exercise attachment points, it is possible to route more than one weight transfer cable along the attachment. For example, an attachment can have two terminal bones that fork from a single bone, and the two terminal bones each have an exercise attachment point served by its own weight-transfer cable. The attachment can be raised, lowered, rotated, and otherwise positioned as desired, and then the athlete can use the exercise attachment points simultaneously, as in a two-handed latissimus pull-down, a standing curl, a squat, or a rowing exercise, for example. Moreover, exercises here-to-fore not possible with conventional exercise equipment are now possible. For example, torso-twisting exercises against significant weight are now possible, where two hands or a hand and a foot (or even both hands and both feet), each engage its own exercise engagement device connecting via weight-transfer cables to one or more weight stacks. Indeed, each physiological limb of an athlete can engage its own resistance, and the range of positions of attachments means that virtually any motion of the human body now can be exercised and strengthened. The head, chest, waist, hips, shoulders, upper arms, knees, ankles, and any other portion of the body that can safely lean into and move against a resistance can be exercised, alone or in combination with other portions.

[0052] Certain embodiments of the present invention comprise one or more assists. An assist, as used herein, is a means by which an attachment is protected from unsupported movement. For example, when the retractable positioning pin is retracted, the positioning apparatus can move relative to the spherical base due to the weight of the extension arm. If an operator is not careful, the extension arm could fall, causing injury or damage to the apparatus or the attachment. Accordingly, an assist can dampen such movement by providing a restraint between the extension arm and the frame of the apparatus, in some cases, or between a first extension arm or a second extension arm. Any suitable assist can be used. For example, an assist can comprise a spring or elastic band, in particular if mounted above the attachment or extension arm being supported. In another example, an assist can comprise a hydraulic device, a pneumatic device, a spring-enabled device, an electromechanical device, or a combination thereof. An assist can attach with any suitable means. In some cases, both ends of the assist attach with universal ball joints to impart the greatest possible freedom to position the assisted extension arm as desired.

[0053] The apparatuses and the attachments of the present invention can be made according to any suitable method. Casting, welding, bolting together the various components, each technique alone or in combination, can be employed. The materials useful in those apparatuses and attachments are not limited. As mentioned above, suitable materials for the positioning apparatus include, but are not limited to, steel, aluminum, titanium, poly(tetrafluoroethylene), nylon, high density polyethylene, polypropylene, and combinations thereof.

[0054] Still further embodiments of the present invention relate to methods of configuring an apparatus for exercising against a resistance, comprising: obtaining an apparatus having a single “bone” as described herein; positioning the positioning apparatus relative to the spherical base; and selectively interlocking a position port with the at least one retractable positioning pin, securing the positioning apparatus relative to the spherical base, thereby configuring the apparatus for exercising against the resistance. Additional methods for configuring an apparatus for exercising against a resistance, comprise, for example, obtaining an apparatus with two “bones,” positioning the first positioning apparatus relative to the first spherical base; selectively interlocking a first position port with the at least one first retractable positioning pin, securing the first positioning apparatus relative to the first spherical base; and positioning the second positioning apparatus relative to the second spherical base; selectively interlocking a second position port with the at least one second retractable positioning pin, securing the second positioning apparatus relative to the second spherical base, thereby configuring the apparatus for exercising against the resistance.

Detailed Description of the Drawings

[0055] Further embodiments of the present invention can be described by reference to the accompanying drawings.

[0056] Fig. 1 shows, in one embodiment of the invention, apparatus 101 for exercising against a resistance. Apparatus 101 comprises weight- transfer cable 150, frame 190 comprising a plurality of vertical members (191 , 192) mutually supporting horizontal member 193, cable guide 143 attached to frame 190 and cable guide 144 attached to weight stack 115, the cable guides 143, 144 being adapted to route weight-transfer cable 150 about the frame 190. Weight stack 115 comprises a number of weight plates 116 that can be selectively moved when a tension is applied to weight transfer cable 150.

This provides the resistance for exercising. Cable tensioning reel 102 is adapted to receive an excess of weight-transfer cable 150, and is positioned on first vertical member 191. Spring-loaded retractable pin 104 allows cable tensioning reel 102 to be removably and adjustably attached to first vertical member 191. In other words, cable tensioning reel 102 can be slid up or down first vertical member 191 , or removed to horizontal member 193. Retractable spool position pin 103 allows for selectively locking cable tensioning reel 102 when the slack is sufficiently removed from weight transfer cable 150.

[0057] Attachment 103 comprises spherical base 110 attached to the second vertical member 192 comprises a plurality of position ports 111 distributed on spherical base 110. Spherical base 110 attaches to frame 190 at vertical frame member 192 with mounting post 113 and retractable mounting pin 112. Positioning apparatus 120 adjustably engages spherical base 110 with retractable positioning pin 121 securing positioning apparatus 120 relative to spherical base 110 by selectively interlocking a position port (not seen) among the plurality of position ports 111. Positioning apparatus 120 is not attached to frame 190 or vertical frame member 192. Accordingly, it can be said that extension arm 130 is attached to positioning apparatus 120, which is not attached to frame 190. Cable guides 141 , 142 route the weight- transfer cable 150 along the extension arm 130, which is attached to positioning apparatus 120. Exercise attachment point 160, which comprises a double pulley, appears on extension arm 130 distal from positioning apparatus 120, and receives a terminus 170 of weight-transfer cable 150.

Add terminus 170, cable stop 171 and clip 172 appear. Cable stop 171 is a rubber sphere that keeps terminus 170 from exiting exercise attachment point 160. Clip 172 can receive an exercise engagement device such as a hand grip (not shown). With a hand grip attached to clip 172, a person can put tension on weight-transfer cable 150 and selectively move one or more weight plates 116 and weight stack 115, and thereby exercising against a resistance. [0058] Fig. 2 depicts another embodiment comprising attachment 203 for exercising against a resistance. Attachment 203 comprises a first spherical base 210 comprising a plurality of first position ports 211 distributed on the first spherical base 210. First positioning apparatus 220 adjustably engages first spherical base 210, and first retractable positioning pin 221 secures first positioning apparatus 220 relative to first spherical base 210 by selectively interlocking a first position port (not seen) among the plurality of first position ports 211. First extension arm 230 is attached to the first positioning apparatus 220, and first cable guides 241 , 242 route weight- transfer cable 250 along first extension arm 230. Second spherical base 215 is attached to first extension arm 230 distal or distant from first positioning apparatus 220, and comprises a plurality of second position ports 216 distributed on the second spherical base 215. Second positioning apparatus 225 adjustably engages second spherical base 215, and second extension arm 235 is attached to the second positioning apparatus 225, which is not attached to first extension arm 215. Second retractable positioning pin 226 secures second positioning apparatus 225 relative to second spherical base 215 by selectively interlocking a second position port (not seen) among the plurality of second position ports 216. Second cable guide 257 routes weight- transfer cable 250 along second extension arm 235 to exercise attachment point 260. Exercise attachment point 260, which is a double pulley distal from the second positioning apparatus 225, receives a terminus 270 of weight- transfer cable 250. Terminus 270 comprises cable stop 271 and clip 272. When clip 272 attaches an exercise engagement device such as a hand grip, a person pulling on the hand grip can put tension on weight-transfer cable 250, and thereby exercise against a resistance.

[0059] Fig. 3 depicts cable guide 340. Cable guide 340 comprises a dual pulley assembly, which includes a plurality of first pulley wheels 361 ,

362, 363 arranged annularly to maintain weight-transfer cable 350 within the plurality of first pulley wheels 361 , 362, 363. The dual pulley assembly of cable guide 340 also includes a plurality of second pulley wheels 371 , 372, 373 arranged annularly to maintain the weight-transfer cable 350 within the plurality of second pulley wheels 371 , 372, 373. The plurality of first pulley wheels 361 , 362, 363 also includes a fourth wheel not visible in Fig. 3. The plurality of second pulley wheels 371 , 372, 373 also includes another fourth wheel not visible in Fig. 3. As can be appreciated from Fig. 3, first pulley wheels 361 , 362, 363 are arranged at 90° to each other. It can be said that the plurality of first pulley wheels 361 , 362, 363 exhibit angles of arrangement between them that are substantially the same. The same can be said for second pulley wheels 371 , 372, 373. It can be further appreciated that cable guide 340 can manage weight-transfer cable 350 approaching cable guide 340 from a wide variety of directions at either end of cable guide 340.

[0060] Figs. 4 and 5 depict cable guide 440. Fig. 4 shows a side elevation view of cable guide 440. Fig. 5 shows a view of cable guide 440 looking along the direction of weight-transfer cable 450 as it passes through cable guide 440. Cable guide 440 includes a pulley assembly having a plurality of pulley wheels 461 , 462, 463, 464 arranged annularly to maintain weight transfer cable 450 within the plurality pulley wheels 461 , 462, 463, 464. Fig. 5 shows that cable guide 440 can be contained within tube 490, which anchors pulley supports 481 , 482, 483, 484. Fig. 5 also shows that pulley wheels 461 , 462, 463, 464, exhibit angles of arrangement between them that are substantially the same, namely, 90°. It can be seen further in Fig. 5 that the close proximity of pulley wheels 461 , 462, 463, 464 arranged annularly maintains weight-transfer cable 450 within the plurality of those pulley wheels. [0061] Fig. 6 provides a perspective view of cable tensioning reel 602. Cable tensioning reel 602 comprises a spool 620 for winding a portion of weigh t-transfer cable 650. Spool position plate 630 rotates with spool 620 and comprises a plurality of spool position ports 631 , 632, 633, 634. Spool locking plate 640 holds retractable spool position pin 603, which selectively engages spool position port 633 to selectively lock spool 620. Brace 660 attaches cable tensioning reel 602 to an apparatus such as apparatus 101 shown in Fig. 1.

[0062] Fig. 7 provides a perspective view of cable tensioning reel 702. Like cable tensioning reel 602, cable tensioning reel 702 comprises a spool 720 for winding a portion of weight-transfer cable 750. Spool position plate 730 comprises a plurality of spool position ports 731 , 732, 733, 734. Spool locking plate 740 rotates with spool 720 and holds retractable spool position pin 703, which selectively engages spool position port 733 to selectively lock spool 720. Brace 760 attaches cable tensioning reel 702 to an apparatus such as apparatus 101 shown in Fig. 1. Cable tensioning reel 702 further comprises a coil spring 790 that engages pin 791 to turn spool 720 to take up the excess of weight-transfer cable 750 when retractable spool position pin 703 is disengaged from spool position plate 730. In cable tensioning reel 702, spool-locking plate 740 rotates with the spool 720, while in cable tensioning reel 602, it is spool position plate 630 that rotates with spool 620.

[0063] Fig. 8 depicts spherical base 810 in an elevation view. In Fig. 9, positioning apparatus 820 also appears. Spherical base 810 includes a plurality of position ports 811 distributed on the spherical base 810. Spherical base 810 comprises spherical base metal surface 860. Spherical base polymer layer 870, a portion of which has been cut away to reveal spherical base metal surface 860, which it covers. Mounting post 880 is adapted to engage a frame of an apparatus for exercising against a resistance, such as, for example, frame 190 seen in Fig. 1. Alternatively, any one of position ports 811 can serve as a mounting post receiver adapted to receive a frame mounting post (not shown) to engage a frame of an apparatus for exercising against a resistance. In yet another alternative, a dedicated mounting post receiver can be larger or smaller or otherwise different from a position port 811. Positioning apparatus 820 adjustably engages spherical base 810 as seen in Fig. 9. Retractable positioning pin 821 secures positioning apparatus 820 relative to spherical base 810 by selectively interlocking a position port 811. Extension arm 830 attaches to the positioning apparatus 820.

Positioning apparatus 820 includes positioning apparatus polymer layer 822 over positioning apparatus metal surface 823. Positioning apparatus 820 has a dimension greater than the diameter of spherical base 810 in the following manner. A diameter 890 of spherical base 810 contacts two points 824, 825 of positioning apparatus 820. In other words, positioning apparatus 820 engages more than a diameter 890 of spherical base 810. In this manner, when retractable positioning pin 821 disengages position port 811 , positioning apparatus 820 can be moved over the spherical base polymer layer 870 of spherical base 810, but positioning apparatus 820 does not disengage spherical base 810. In other words, pulling pin 821 does not cause positioning apparatus 820 to fall off of spherical base 810.

[0064] Fig. 10 shows spherical base 1010 in a right side elevation view. A plurality of position ports 1011 are distributed across spherical base 1010. Spherical base 1010 is not completely spherical, yet still represents an embodiment of the present invention. As used herein, “spherical base” does not require a perfect sphere. Mounting post 1080, adapted to engage a frame of an apparatus for exercising against a resistance, allows spherical base 1010 to be attached to for example, the apparatus 101 as shown in Fig. 1 . [0065] Fig. 11 depicts spherical base 1110 in a right side elevation view. A plurality of position ports 1111 are distributed across spherical base 1110. Spherical base 1010 is hemispherical, yet still represents an embodiment of the present invention. Mounting post 1180, adapted to engage a frame of an apparatus for exercising against a resistance, allows spherical base 1110 to be attached to, for example, the apparatus 101 as shown in Fig. 1.

[0066] Fig. 12 provides a perspective view of a portion of extension arm 1230 with first cable guide 1241 and second cable guide 1242. First cable guide 1241 comprises first bearing race 1291 ; second cable guide 1242 comprises a second bearing race 1292. Each bearing race comprises ball bearings positioned to smoothly guide weight-transfer cable 1250 as it travels back and forth through first cable guide 1241 and second cable guide 1242 during an exercise. Optionally, first cable guide 1241 and second cable guide 1242 can be slid along the extension arm 1230 to optimize their ability to keep weigh t-transfer cable 1250 from undesirable contact during an exercise.

[0067] Fig. 13 depicts a portion of attachment 1303. Mounting post 1380 is adapted to engage a frame of an apparatus for exercising against a resistance (not shown), and connects to first spherical base 1310. A plurality of first position ports 1311 are distributed across first spherical base 1310. Positioning apparatus 1320 adjustably engages first spherical base 1310, and comprises first retractable positioning pin 1321 and second retractable positioning pin 1322, which are spring-loaded and are operated by squeeze levers 1325, 1326, pulling positioning cables 1323, 1324, respectively. Extension arm 1330 is attached to positioning apparatus 1320, and also mounts second spherical base 1340. A plurality of second position ports 1341 are distributed across second spherical base 1340. Second spherical base is adapted to receive another positioning apparatus (not shown) and extension arm (not shown). When squeeze levers 1325, 1326 are operated, first positioning pin 1321 and second positioning pin 1322 are retracted, and extension arm 1330 can maneuvered into a new desired position. Then, squeeze levers 1325, 1326 are released, and at least one of first positioning pin 1321 and second positioning pin 1322 selectively interlock position port(s) among the plurality of first position ports 1311 to secure the new desired position of positioning apparatus 1320 relative to first spherical base 1310. Attachment 1303 is further adapted to receive one or more cable guides (not shown) to route a weight-transfer cable (not shown) along extension arm 1330. Squeeze levers 1325, 1326 may be called squeeze mechanisms. [0068] Fig. 14 depicts attachment 1403. Mounting post 1480 is adapted to engage a frame of an apparatus for exercising against a resistance (not shown), and connects to first spherical base 1410. A plurality of first position ports 1411 are distributed across first spherical base 1410. First positioning apparatus 1420 adjustably engages first spherical base 1410, and comprises first retractable positioning pin 1421 and second retractable positioning pin 1422, which are spring loaded and released by squeeze grips 1425, 1426, pulling positioning cables 1423, 1424, respectively. First extension arm 1430 is attached to first positioning apparatus 1420, and also mounts second positioning apparatus 1434. Squeeze grips 1425, 1426 also release spring-loaded third retractable pin 1429 and fourth retractable pin 1432 at second positioning apparatus 1434 via positioning cables 1427, 1428. Squeeze grips 1425, 1426 can be called squeeze mechanisms. Second positioning apparatus 1434 adjustably engages second spherical base 1440. A plurality of second position ports 1441 are distributed across second spherical base 1440. Second extension arm 1460 is attached to second spherical base 1440. When squeeze grips 1425, 1426 are manipulated, first retractable pin 1421 , second retractable pin 1422, third retractable pin 1429, and retractable pin 1432 retract, and first extension arm 1430 and second extension arm 1460 can be maneuvered into new desired positions. When squeeze grips 1425, 1426 are released, at least one of first retractable pin 1421 and second retractable pin 1422 selectively interlock first position port(s) among the plurality of first position ports 1411 to secure the new position of first extension arm 1430 relative to first spherical base 1410. Also, at least one of third retractable pin 1429 and fourth retractable pin 1432 selectively interlock second position port(s) among the plurality of second position ports 1441 to secure the new position of second extension arm 1460 relative to second positioning apparatus 1434. Cable guides 1451 , 1452, and 1453 route weight-transfer cable 1450 along attachment 1403. Exercise attachment point 1462, which is a double pulley distal from the second spherical base 1440, receives a terminus 1470 of weight-transfer cable 1450. Terminus 1470 comprises cable stop 1471 and clip 1472. When clip 1472 attaches an exercise engagement device such as a hand grip, a person pulling on the hand grip can put tension on weight-transfer cable 1450, and thereby exercise against a resistance.

[0069] Fig. 15 depicts attachment 1503. Mounting post 1580 is adapted to engage a frame of an apparatus for exercising against a resistance (not shown), and connects to first positioning apparatus 1520. A plurality of first position ports 1511 are distributed across first positioning apparatus 1520. First positioning apparatus 1520 adjustably engages first spherical base 1510. First button 1525 operates a first retractable positioning pin (not seen), which is spring loaded and engages a first position port in the plurality of first position ports 1511 to secure first positioning apparatus 1520 relative to first spherical base 1510. First extension arm 1530 is attached to first spherical base 1510, and also mounts second spherical base 1540. Second button 1526 also releases spring-loaded second retractable pin (unseen) at second positioning apparatus 1534. First button 1525 and second button 1526 can be called squeeze mechanisms. Second positioning apparatus 1534 adjustably engages second spherical base 1540. A plurality of second position ports 1541 are distributed across second positioning apparatus 1534. Second extension arm 1560 is attached to second positioning apparatus 1534. When second button 1526 is manipulated, second extension arm 1560 can be maneuvered into a new desired position. Cable guides 1551 , 1552, and 1553 route weight-transfer cable 1550 along attachment 1503. Exercise attachment point 1562, which is a double pulley distal from the second spherical base 1540 and second positioning apparatus 1534, receives a terminus 1570 of weight-transfer cable 1550. Terminus 1570 comprises cable stop 1571 and clip 1572. When clip 1572 attaches an exercise engagement device such as a hand grip, a person pulling on the hand grip can put tension on weight-transfer cable 1550, and thereby exercise against a resistance.

[0070] Fig. 16 depicts attachment 1603. Mounting post 1680 is adapted to engage a frame 1690 of an apparatus for exercising against a resistance (not shown), and connects to first positioning apparatus 1620. A plurality of first position ports 1611 are distributed across first positioning apparatus 1620. First positioning apparatus 1620 adjustably engages first spherical base 1610. First button 1625 operates a first retractable positioning pin (not seen), which is spring loaded and engages a first position port in the plurality of first position ports 1611 to secure first positioning apparatus 1620 relative to first spherical base 1610. First extension arm 1630 is attached to first spherical base 1610, and also mounts second spherical base 1640. Second button 1626 also releases spring-loaded second retractable pin (unseen) at second positioning apparatus 1634. First button 1625 and second button 1626 can be called squeeze mechanisms. Second positioning apparatus 1634 adjustably engages second spherical base 1640. A plurality of second position ports 1641 are distributed across second positioning apparatus 1634. Second extension arm 1660 is attached to second positioning apparatus 1634. When second button 1626 is manipulated, second extension arm 1660 can be maneuvered into a new desired position. Cable guides 1651 , 1652, and 1653 route weight-transfer cable 1650 along attachment 1603. Exercise attachment point 1662, which is a double pulley distal from the second spherical base 1640 and second positioning apparatus 1634, receives a terminus 1670 of weight-transfer cable 1650. Terminus 1670 comprises cable stop 1671 and clip 1672. When clip 1672 attaches an exercise engagement device such as a hand grip, a person pulling on the hand grip can put tension on weight-transfer cable 1650, and thereby exercise against a resistance. Attachment 1603 further comprises assist 1685 and vertical member 1691 of frame 1690 of an apparatus (not fully shown). Assist 1685 comprises first universal ball joint 1681 having spring-loaded pin 1688 to mount assist 1685 on frame 1690, and second universal ball joint 1689 attaching to first extension arm 1630. Pneumatic cylinder 1683 receives piston 1684. When first button 1625 is activated, assist 1685 operates to dampen movement of first extension arm 1630 so it does not come crashing down while it is unsupported or not secured at first spherical base 1610 or first positioning apparatus 1620.

Embodiments

[0071] Embodiment 1. An attachment for exercising against a resistance, comprising: a spherical base; a positioning apparatus adjustably engaging the spherical base; a plurality of position ports distributed on the spherical base or on the positioning apparatus; at least one retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality of position ports; an extension arm attached to the positioning apparatus or the spherical base; at least one cable guide for routing a weight-transfer cable along the extension arm; and an exercise attachment point on the extension arm distal from the positioning apparatus and the spherical base for receiving a terminus of the weight-transfer cable.

[0072] Embodiment 2. The attachment of embodiment 1 , wherein the spherical base comprises a spherical base metal surface.

[0073] Embodiment s. The attachment of embodiment 2, wherein the spherical base further comprises a spherical base polymer layer over the spherical base metal surface.

[0074] Embodiment 4. The attachment of any one of the preceding embodiments, wherein the spherical base is hemispherical.

[0075] Embodiment 5. The attachment of any one of the preceding embodiments, wherein the spherical base or the positioning apparatus, whichever is not attached to the extension arm, further comprises a mounting post adapted to engage a frame of an apparatus for exercising against a resistance.

[0076] Embodiment 6. The attachment of any one embodiments 1-4, wherein the spherical base or the positioning apparatus, whichever is not attached to the extension arm, further comprises a mounting post receiver adapted to receive a frame mounting post to engage a frame of an apparatus for exercising against a resistance. [0077] Embodiment 7. The attachment of any one of the preceding embodiments, wherein the positioning apparatus has a dimension greater than the diameter of the spherical base.

[0078] Embodiment 8. The attachment of any one of the preceding embodiments, wherein the positioning apparatus comprises a positioning apparatus metal surface.

[0079] Embodiment 9. The attachment of embodiment 8, wherein the positioning apparatus further comprises a positioning apparatus polymer layer over the positioning apparatus metal surface.

[0080] Embodiment 10. The attachment of any one of the preceding embodiments, wherein the spherical base polymer layer comprises poly(tetrafluoroethylene), nylon, high density polyethylene, polypropylene, or a combination thereof.

[0081] Embodiment 11. The attachment of any one of the preceding embodiments, wherein the positioning apparatus polymer layer comprises poly(tetrafluoroethylene), nylon, high density polyethylene, polypropylene, or a combination thereof.

[0082] Embodiment 12. The attachment of any one of the preceding embodiments, wherein the at least one cable guide comprises at least one bearing race.

[0083] Embodiment 13. The attachment of any one of the preceding embodiments, wherein the at least one cable guide comprises a pulley assembly, the pulley assembly comprising a plurality of pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of pulley wheels. [0084] Embodiment 14. The attachment of embodiment 13, wherein the pulley assembly comprises four pulley wheels in the plurality of pulley wheels.

[0085] Embodiment 15. The attachment of any one of embodiments 13-14, wherein the pulley wheels in the plurality of pulley wheels exhibit angles of arrangement between the pulley wheels that are substantially the same.

[0086] Embodiment 16. The attachment of any one of embodiments 1- 12, wherein the at least one cable guide comprises a dual pulley assembly, the dual pulley assembly comprising: a plurality of first pulley wheels arranged annularly to maintain the weight- transfer cable within the plurality of first pulley wheels; and a plurality of second pulley wheels arranged annularly to maintain the weight- transfer cable within the plurality of second pulley wheels.

[0087] Embodiment 17. The attachment of any one of the preceding embodiments, wherein the exercise attachment point comprises a double pulley.

[0088] Embodiment 18. The attachment of any one of the preceding embodiments, wherein the terminus of the weight-transfer cable comprises a cable stop and a clip adapted to engage an exercise engagement device.

[0089] Embodiment 19. The attachment of embodiment 18, wherein the exercise engagement device comprises a hand grip, an ankle strap, a torso strap, a head strap, an elastic band, a barbell, or a dumbbell.

[0090] Embodiment 20. An attachment for exercising against a resistance, comprising: a first spherical base; a first positioning apparatus adjustably engaging the first spherical base; a plurality of first position ports distributed on the first spherical base or on the first positioning apparatus; at least one first retractable positioning pin adapted to secure the first positioning apparatus relative to the first spherical base by selectively interlocking a first position port among the plurality of first position ports; a first extension arm attached to the first positioning apparatus or the first spherical base; at least one first cable guide for routing a weight-transfer cable along the first extension arm; a second spherical base and a second positioning apparatus adjustably engaging the second spherical base; wherein the second spherical base or the second positioning apparatus is attached to the first extension arm distal from the first positioning apparatus and the first spherical base; a plurality of second position ports distributed on the second spherical base or the second positioning apparatus; at least one second retractable positioning pin adapted to secure the second positioning apparatus relative to the second spherical base by selectively interlocking a second position port among the plurality of second position ports; a second extension arm attached to the second positioning apparatus or the second spherical base, whichever is not attached to the first extension arm; at least one second cable guide for routing the weight-transfer cable along the second extension arm; and an exercise attachment point on the second extension arm distal from the second positioning apparatus and the second spherical base for receiving a terminus of the weigh t-transfer cable.

[0091] Embodiment 21. The attachment of embodiment 20, wherein the first spherical base comprises a first spherical base metal surface, and a first spherical base polymer layer over the first spherical base metal surface; and the second spherical base comprises a second spherical base metal surface, and a second spherical base polymer layer over the second spherical base metal surface.

[0092] Embodiment 22. The attachment of any one of embodiments 20-21 , wherein the first spherical base is hemispherical.

[0093] Embodiment 23. The attachment of any one of embodiments 20-22, wherein the first spherical base or the first positioning apparatus further comprises a mounting post adapted to engage a frame of an apparatus for exercising against a resistance.

[0094] Embodiment 24. The attachment of any one of embodiments 20-23, wherein the second spherical base is hemispherical.

[0095] Embodiment 25. The attachment of any one of embodiments 20-24, wherein the first positioning apparatus has a first dimension greater than a diameter of the first spherical base.

[0096] Embodiment 26. The attachment of any one of embodiments 20-25, wherein the second positioning apparatus has a second dimension greater than a diameter of the second spherical base.

[0097] Embodiment 27. The attachment of any one of embodiments 20-26, wherein the at least one first cable guide comprises at least one first bearing race.

[0098] Embodiment 28. The attachment of any one of embodiments 20-27, wherein the at least one second cable guide comprises at least one second bearing race. [0099] Embodiment 29. The attachment of any one of embodiments 20-28, wherein the at least one first cable guide comprises a first pulley assembly, the first pulley assembly comprising a plurality of first pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of first pulley wheels.

[00100] Embodiment 30. The attachment of embodiment 29, wherein the first pulley assembly comprises four first pulley wheels in the plurality of first pulley wheels.

[00101] Embodiment 31. The attachment of any one of embodiments 20-30, wherein the first pulley wheels in the plurality of first pulley wheels exhibit first angles of arrangement between the first pulley wheels that are substantially the same.

[00102] Embodiment 32. The attachment of any one of embodiments 20-31 , wherein the at least one first cable guide comprises a first dual pulley assembly, the first dual pulley assembly comprising: a plurality of first intake pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of first intake pulley wheels; and a plurality of first outgoing pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of first outgoing pulley wheels.

[00103] Embodiment 33. The attachment of any one of embodiments 20-32, wherein the at least one second cable guide comprises a second pulley assembly, the second pulley assembly comprising a plurality of second pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of second pulley wheels.

[00104] Embodiment 34. The attachment of embodiment 33, wherein the second pulley assembly comprises four second pulley wheels in the plurality of second pulley wheels. [00105] Embodiment 35. The attachment of any one of embodiments 20-34, wherein the second pulley wheels in the plurality of second pulley wheels exhibit second angles of arrangement between the second pulley wheels that are substantially the same.

[00106] Embodiment 36. The attachment of any one of embodiments 20-35, wherein the at least one second cable guide comprises a second dual pulley assembly, the second dual pulley assembly comprising: a plurality of second intake pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of second intake pulley wheels; and a plurality of second outgoing pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of second outgoing pulley wheels.

[00107] Embodiment 37. The attachment of any one of embodiments 20-36, wherein the exercise attachment point comprises a double pulley.

[00108] Embodiment 38. The attachment of any one of embodiments 20-37, wherein the terminus of the weight-transfer cable comprises a cable stop and a clip adapted to engage an exercise engagement device.

[00109] Embodiment 39. The attachment of embodiment 38, wherein the exercise engagement device comprises a hand grip, an ankle strap, a torso strap, a head strap, an elastic band, a barbell, or a dumbbell.

[00110] Embodiment 40. The attachment of any one of embodiments 1 -

39, further comprising at least one squeeze mechanism configured to selectively retract the at least one retractable positioning pin.

[00111]

[00112] Embodiment 41. The attachment of any one of embodiments 1-

40, further comprising at least one assist configured to support the extension arm, the first extension arm, the second extension arm, or a combination thereof.

[00113] Embodiment 42. An apparatus for exercising against a resistance, comprising: a weight-transfer cable; a frame comprising a plurality of vertical members mutually supporting one or more horizontal members; a plurality of cable guides attached to the frame adapted to route the weight- transfer cable about the frame; a cable tensioning reel adapted to receive an excess of the weight transfer cable, the cable tensioning reel positioned on a first vertical member among the plurality of vertical members or the one or more horizontal members; a weight stack comprising one or more weight plates that can be selectively moved when a tension is applied to the weight transfer cable, thereby providing the resistance; an attachment for exercising against the resistance, comprising: a spherical base; a positioning apparatus adjustably engaging the spherical base; wherein the spherical base or the positioning apparatus is attached to the frame; at least one retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality of position ports; an extension arm attached to the positioning apparatus or the spherical base, whichever is not attached to the frame; at least one cable guide for routing the weight-transfer cable along the extension arm; and an exercise attachment point on the extension arm distal from the positioning apparatus and the spherical base for receiving a terminus of the weight-transfer cable. [00114] Embodiment 43. The apparatus of embodiment 42, wherein the cable tensioning reel is removably and adjustably attached to the first vertical member.

[00115] Embodiment 44. The apparatus of any one of embodiments 42-

43, wherein the cable tensioning reel comprises a spool for winding a portion of the weight-transfer cable; a spool position plate that rotates with the spool comprising a plurality of spool position ports; and a spool-locking plate for selectively locking the spool by selectively engaging a spool position port among the plurality of spool position ports with a retractable spool position pin.

[00116] Embodiment 45. The apparatus of embodiment 44, wherein the cable tensioning reel further comprises a coil spring adapted to turn the spool to take up the excess of the weight-transfer cable.

[00117] Embodiment 46. The apparatus of any one of embodiments 42-

45, wherein the attachment for exercising against the resistance is the attachment of any one of embodiments 1 -41.

[00118] Embodiment 47. An apparatus for exercising against a resistance, comprising: a weight transfer cable; a frame comprising a plurality of vertical members mutually supporting one or more horizontal members; a cable tensioning reel adapted to receive an excess of the weight transfer cable, the cable tensioning reel positioned on a first vertical member of the plurality of vertical members or the at least one horizontal member; a weight stack comprising one or more weight plates that can be selectively moved when a tension is applied to the weight transfer cable, thereby providing the resistance; an attachment for exercising against the resistance, comprising: a first spherical base; a first positioning apparatus adjustably engaging the first spherical base; a plurality of first position ports distributed on the first spherical base or the first positioning apparatus; wherein the first spherical base or the first positioning apparatus is attached to the frame; at least one first retractable positioning pin adapted to secure the first positioning apparatus relative to the first spherical base by selectively interlocking a first position port among the plurality of first position ports; a first extension arm attached to the first positioning apparatus or the first spherical base, whichever is not attached to the frame; at least one first cable guide for routing the weight-transfer cable along the first extension arm; and a second spherical base; a second positioning apparatus adjustably engaging the second spherical base; a plurality of second position ports distributed on the second spherical base or the second positioning apparatus; wherein the second spherical base or the second positioning apparatus is attached to the first extension arm distal from the first positioning apparatus and the first spherical base; at least one second retractable positioning pin adapted to secure the second positioning apparatus relative to the second spherical base by selectively interlocking a second position port among the plurality of second position ports; a second extension arm attached to the second positioning apparatus or the second spherical base, whichever is not attached to the first extension arm; at least one second cable guide for routing the weight-transfer cable along the second extension arm; and an exercise attachment point on the second extension arm distal from the second positioning apparatus and the second spherical base for receiving a terminus of the weigh t-transfer cable.

[00119] Embodiment 48. The apparatus of embodiment 47, wherein the attachment for exercising against the resistance is the attachment of any one of embodiments 20-41.

[00120] Embodiment 49. A method of configuring an apparatus for exercising against a resistance, comprising: obtaining the apparatus of any one of embodiments 42-46; positioning the positioning apparatus relative to the spherical base; and selectively interlocking a position port with the at least one retractable positioning pin, securing the positioning apparatus relative to the spherical base, thereby configuring the apparatus for exercising against the resistance.

[00121] Embodiment 50. A method of configuring an apparatus for exercising against a resistance, comprising: obtaining the apparatus of any one of embodiments 47-48; positioning the first positioning apparatus relative to the first spherical base; selectively interlocking a first position port with the at least one first retractable positioning pin, securing the first positioning apparatus relative to the first spherical base; and positioning the second positioning apparatus relative to the second spherical base; selectively interlocking a second position port with the at least one second retractable positioning pin, securing the second positioning apparatus relative to the second spherical base, thereby configuring the apparatus for exercising against the resistance.

[00122] Embodiment 51. An attachment for exercising against a resistance, comprising: a spherical base comprising at least one retractable positioning pin; a positioning apparatus comprising a plurality of position ports distributed on the positioning apparatus; the positioning apparatus adjustably engaging the spherical base; the at least one retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality of position ports; an extension arm attached to the spherical base; at least one cable guide for routing a weight-transfer cable along the extension arm; and an exercise attachment point on the extension arm distal from the spherical base for receiving a terminus of the weight-transfer cable.

[00123] Embodiment 52. An attachment for exercising against a resistance, comprising: a spherical base; a positioning apparatus adjustably engaging the spherical base; a plurality of position ports distributed on the spherical base or the positioning apparatus; at least one retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality of position ports; an extension arm attached to the positioning apparatus or the spherical base; at least one cable guide for routing a weight-transfer cable along the extension arm; and an exercise attachment point on the extension arm distal from the positioning apparatus and the spherical base for receiving a terminus of the weight- transfer cable.

[00124] Embodiment 53. The attachment of any one of embodiments 51-52, wherein the attachment is the attachment of any one of embodiments 1-41. [00125] As previously stated, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention that may be embodied in various forms. It will be appreciated that many modifications and other variations stand within the intended scope of this invention as claimed below. Furthermore, the foregoing description of various embodiments does not necessarily imply exclusion. For example, “some” embodiments may include all or part of “other” and “further” embodiments within the scope of this invention. In addition, “a” does not mean “one and only one;” “a” can mean “one and more than one.”

Claims

We Claim:

1. An attachment for exercising against a resistance, comprising: a spherical base; a positioning apparatus adjustably engaging the spherical base; a plurality of position ports distributed on the spherical base or on the positioning apparatus; at least one retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality of position ports; an extension arm attached to the positioning apparatus or the spherical base; at least one cable guide for routing a weight-transfer cable along the extension arm; and an exercise attachment point on the extension arm distal from the positioning apparatus and the spherical base for receiving a terminus of the weight-transfer cable.

2. The attachment of claim 1 , wherein the spherical base comprises a spherical base metal surface.

3. The attachment of claim 2, wherein the spherical base further comprises a spherical base polymer layer over the spherical base metal surface.

4. The attachment of any one of the preceding claims, wherein the spherical base is hemispherical.

5. The attachment of any one of the preceding claims, wherein the spherical base or the positioning apparatus, whichever is not attached to the extension arm, further comprises a mounting post adapted to engage a frame of an apparatus for exercising against a resistance.

6. The attachment of any one claims 1-4, wherein the spherical base or the positioning apparatus, whichever is not attached to the extension arm, further comprises a mounting post receiver adapted to receive a frame mounting post to engage a frame of an apparatus for exercising against a resistance.

7. The attachment of any one of the preceding claims, wherein the positioning apparatus has a dimension greater than the diameter of the spherical base.

8. The attachment of any one of the preceding claims, wherein the positioning apparatus comprises a positioning apparatus metal surface.

9. The attachment of claim 8, wherein the positioning apparatus further comprises a positioning apparatus polymer layer over the positioning apparatus metal surface.

10. The attachment of any one of the preceding claims, wherein the spherical base polymer layer comprises poly(tetrafluoroethylene), nylon, high density polyethylene, polypropylene, or a combination thereof.

11. The attachment of any one of the preceding claims, wherein the positioning apparatus polymer layer comprises poly(tetrafluoroethylene), nylon, high density polyethylene, polypropylene, or a combination thereof.

12. The attachment of any one of the preceding claims, wherein the at least one cable guide comprises at least one bearing race.

13. The attachment of any one of the preceding claims, wherein the at least one cable guide comprises a pulley assembly, the pulley assembly comprising a plurality of pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of pulley wheels.

14. The attachment of claim 13, wherein the pulley assembly comprises four pulley wheels in the plurality of pulley wheels.

15. The attachment of any one of claims 13-14, wherein the pulley wheels in the plurality of pulley wheels exhibit angles of arrangement between the pulley wheels that are substantially the same.

16. The attachment of any one of claims 1-12, wherein the at least one cable guide comprises a dual pulley assembly, the dual pulley assembly comprising: a plurality of first pulley wheels arranged annularly to maintain the weight- transfer cable within the plurality of first pulley wheels; and a plurality of second pulley wheels arranged annularly to maintain the weight- transfer cable within the plurality of second pulley wheels.

17. The attachment of any one of the preceding claims, wherein the exercise attachment point comprises a double pulley.

18. The attachment of any one of the preceding claims, wherein the terminus of the weight-transfer cable comprises a cable stop and a clip adapted to engage an exercise engagement device.

19. The attachment of claim 18, wherein the exercise engagement device comprises a hand grip, an ankle strap, a torso strap, a head strap, an elastic band, a barbell, or a dumbbell.

20. An attachment for exercising against a resistance, comprising: a first spherical base; a first positioning apparatus adjustably engaging the first spherical base; a plurality of first position ports distributed on the first spherical base or on the first positioning apparatus; at least one first retractable positioning pin adapted to secure the first positioning apparatus relative to the first spherical base by selectively interlocking a first position port among the plurality of first position ports; a first extension arm attached to the first positioning apparatus or the first spherical base; at least one first cable guide for routing a weight-transfer cable along the first extension arm; a second spherical base; a second positioning apparatus adjustably engaging the second spherical base; wherein the second spherical base or the second positioning apparatus is attached to the first extension arm distal from the first positioning apparatus and the first spherical base; a plurality of second position ports distributed on the second spherical base or on the second positioning apparatus; at least one second retractable positioning pin adapted to secure the second positioning apparatus relative to the second spherical base by selectively interlocking a second position port among the plurality of second position ports; a second extension arm attached to the second positioning apparatus or the second spherical base, whichever is not attached to the first extension arm; at least one second cable guide for routing the weight-transfer cable along the second extension arm; and an exercise attachment point on the second extension arm distal from the second positioning apparatus and the second spherical base for receiving a terminus of the weight-transfer cable.

21. The attachment of claim 20, wherein the first spherical base comprises a first spherical base metal surface, and a first spherical base polymer layer over the first spherical base metal surface; and the second spherical base comprises a second spherical base metal surface, and a second spherical base polymer layer over the second spherical base metal surface.

22. The attachment of any one of claims 20-21 , wherein the first spherical base is hemispherical.

23. The attachment of any one of claims 20-22, wherein the first spherical base or the first positioning apparatus, whichever is not attached to the first extension arm, further comprises a mounting post adapted to engage a frame of an apparatus for exercising against a resistance.

24. The attachment of any one of claims 20-23, wherein the second spherical base is hemispherical.

25. The attachment of any one of claims 20-24, wherein the first positioning apparatus has a first dimension greater than a diameter of the first spherical base.

26. The attachment of any one of claims 20-25, wherein the second positioning apparatus has a second dimension greater than a diameter of the second spherical base.

27. The attachment of any one of claims 20-26, wherein the at least one first cable guide comprises at least one first bearing race.

28. The attachment of any one of claims 20-27, wherein the at least one second cable guide comprises at least one second bearing race.

29. The attachment of any one of claims 20-28, wherein the at least one first cable guide comprises a first pulley assembly, the first pulley assembly comprising a plurality of first pulley wheels arranged annularly to maintain the weigh t-transfer cable within the plurality of first pulley wheels.

30. The attachment of claim 29, wherein the first pulley assembly comprises four first pulley wheels in the plurality of first pulley wheels.

31. The attachment of any one of claims 29-30, wherein the first pulley wheels in the plurality of first pulley wheels exhibit first angles of arrangement between the first pulley wheels that are substantially the same.

32. The attachment of any one of claims 20-31 , wherein the at least one first cable guide comprises a first dual pulley assembly, the first dual pulley assembly comprising: a plurality of first intake pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of first intake pulley wheels; and a plurality of first outgoing pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of first outgoing pulley wheels.

33. The attachment of any one of claims 20-32, wherein the at least one second cable guide comprises a second pulley assembly, the second pulley assembly comprising a plurality of second pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of second pulley wheels.

34. The attachment of claim 33, wherein the second pulley assembly comprises four second pulley wheels in the plurality of second pulley wheels.

35. The attachment of any one of claims 20-34, wherein the second pulley wheels in the plurality of second pulley wheels exhibit second angles of arrangement between the second pulley wheels that are substantially the same.

36. The attachment of any one of claims 20-35, wherein the at least one second cable guide comprises a second dual pulley assembly, the second dual pulley assembly comprising: a plurality of second intake pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of second intake pulley wheels; and a plurality of second outgoing pulley wheels arranged annularly to maintain the weight-transfer cable within the plurality of second outgoing pulley wheels.

37. The attachment of any one of claims 20-36, wherein the exercise attachment point comprises a double pulley.

38. The attachment of any one of claims 20-37, wherein the terminus of the weigh t-transfer cable comprises a cable stop and a clip adapted to engage an exercise engagement device.

39. The attachment of claim 38, wherein the exercise engagement device comprises a hand grip, an ankle strap, a torso strap, a head strap, an elastic band, a barbell, or a dumbbell.

40. The attachment of any one of claims 1-39, further comprising at least one squeeze mechanism configured to selectively retract the at least one retractable positioning pin.

41. The attachment of any one of the preceding claims, further comprising at least one assist configured to support the extension arm, the first extension arm, the second extension arm, or a combination thereof.

42. An apparatus for exercising against a resistance, comprising: a weight-transfer cable; a frame comprising a plurality of vertical members mutually supporting one or more horizontal members; a plurality of cable guides attached to the frame adapted to route the weight- transfer cable about the frame; a cable tensioning reel adapted to receive an excess of the weight-transfer cable, the cable tensioning reel positioned on a first vertical member among the plurality of vertical members or the one or more horizontal members; a weight stack comprising one or more weight plates that can be selectively moved when a tension is applied to the weight transfer cable, thereby providing the resistance; an attachment for exercising against the resistance, comprising: a spherical base; a positioning apparatus adjustably engaging the spherical base; wherein the spherical base or the positioning apparatus is attached to the frame; a plurality of position ports distributed on the spherical base or on the positioning apparatus; at least one retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality of position ports; an extension arm attached to the positioning apparatus or the spherical base, whichever is not attached to the frame; at least one cable guide for routing the weight-transfer cable along the extension arm; and an exercise attachment point on the extension arm distal from the positioning apparatus and the spherical base for receiving a terminus of the weight-transfer cable.

43. The apparatus of claim 42, wherein the cable tensioning reel is removably and adjustably attached to the first vertical member.

44. The apparatus of any one of claims 42-43, wherein the cable tensioning reel comprises a spool for winding a portion of the weight-transfer cable; a spool position plate that rotates with the spool comprising a plurality of spool position ports; and a spool-locking plate for selectively locking the spool by selectively engaging a spool position port among the plurality of spool position ports with a retractable spool position pin.

45. The apparatus of claim 44, wherein the cable tensioning reel further comprises a coil spring adapted to turn the spool to take up the excess of the weight-transfer cable.

46. The apparatus of any one of claims 42-45, wherein the attachment for exercising against the resistance is the attachment of any one of claims 1-41.

47. An apparatus for exercising against a resistance, comprising: a weight transfer cable; a frame comprising a plurality of vertical members mutually supporting one or more horizontal members; a cable tensioning reel adapted to receive an excess of the weight transfer cable, the cable tensioning reel positioned on a first vertical member of the plurality of vertical members or the at least one horizontal member; a weight stack comprising one or more weight plates that can be selectively moved when a tension is applied to the weight transfer cable, thereby providing the resistance; an attachment for exercising against the resistance, comprising: a first spherical base; a first positioning apparatus adjustably engaging the first spherical base; wherein the first spherical base or the first positioning apparatus is attached to the frame; a plurality of first position ports distributed on the first spherical base or the first positioning apparatus; at least one first retractable positioning pin adapted to secure the first positioning apparatus relative to the first spherical base by selectively interlocking a first position port among the plurality of first position ports; a first extension arm attached to the first positioning apparatus or the first spherical base, whichever is not attached to the frame; at least one first cable guide for routing the weight-transfer cable along the first extension arm; and a second spherical base attached to the first extension arm distal from the first positioning apparatus and the first spherical base; a second positioning apparatus adjustably engaging the second spherical base; a plurality of second position ports distributed on the second spherical base or the second positioning apparatus; at least one second retractable positioning pin adapted to secure the second positioning apparatus relative to the second spherical base by selectively interlocking a second position port among the plurality of second position ports; a second extension arm attached to the second positioning apparatus or the second spherical base, whichever is not attached to the first extension arm; at least one second cable guide for routing the weight-transfer cable along the second extension arm; and an exercise attachment point on the second extension arm distal from the second positioning apparatus and the second spherical base for receiving a terminus of the weight-transfer cable.

48. The apparatus of claim 47, wherein the attachment for exercising against the resistance is the attachment of any one of claims 20-41.

49. A method of configuring an apparatus for exercising against a resistance, comprising: obtaining the apparatus of any one of claims 42-46; positioning the positioning apparatus relative to the spherical base; and selectively interlocking a position port with the at least one retractable positioning pin, securing the positioning apparatus relative to the spherical base, thereby configuring the apparatus for exercising against the resistance.

50. A method of configuring an apparatus for exercising against a resistance, comprising: obtaining the apparatus of any one of claims 47-48; positioning the first positioning apparatus relative to the first spherical base; selectively interlocking a first position port with the at least one first retractable positioning pin, securing the first positioning apparatus relative to the first spherical base; and positioning the second positioning apparatus relative to the second spherical base; selectively interlocking a second position port with the at least one second retractable positioning pin, securing the second positioning apparatus relative to the second spherical base, thereby configuring the apparatus for exercising against the resistance.

51. An attachment for exercising against a resistance, comprising: a spherical base comprising at least one retractable positioning pin; a positioning apparatus comprising a plurality of position ports distributed on the positioning apparatus; the positioning apparatus adjustably engaging the spherical base; the at least one retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality of position ports; an extension arm attached to the spherical base; at least one cable guide for routing a weight-transfer cable along the extension arm; and an exercise attachment point on the extension arm distal from the spherical base for receiving a terminus of the weight-transfer cable.

52. An attachment for exercising against a resistance, comprising: a spherical base; a positioning apparatus adjustably engaging the spherical base; a plurality of position ports distributed on the spherical base or the positioning apparatus; at least one retractable positioning pin adapted to secure the positioning apparatus relative to the spherical base by selectively interlocking a position port among the plurality of position ports; an extension arm attached to the positioning apparatus or the spherical base; at least one cable guide for routing a weight-transfer cable along the extension arm; and an exercise attachment point on the extension arm distal from the positioning apparatus and the spherical base for receiving a terminus of the weight- transfer cable.

53. The attachment of any one of claims 51-52, wherein the attachment is the attachment of any one of claims 1 -41.