Abstract: A weight lifting device including a housing having first frame having first vertical channel for accommodating first weight holding means, and second frame having second vertical channel for accommodating second weight holding means, wherein first vertical channel and second vertical channel are dimensioned so that first weight holding means and second weight holding means can move up and down, when in use, in first vertical channel and second vertical channel, respectively. The weight lifting device also includes a handle bar pivotably connectable to first weight holding means and to second weight holding means from first end of handle bar and second end of handle bar, respectively. The weight lifting device further includes at least one of: first holding bar, second holding bar, first pivotable arm, and second pivotable arm, arranged between pivotably connectable handle bar and first weight holding means and second weight holding means.

Abstract: A resistance band exercise machine for performing various exercises. An embodiment includes a housing for a cable-pulley variable resistance system. Some embodiments are configured to receive one or more safety bars to set a starting position of an exercise. Some embodiments include a training partner assistantship feature for a training partner to assist the user by imparting a secondary force on the machine. The configuration of the cable-pulley variable resistance system may be in any manner based on the exercise. In some embodiments, a user performs an exercise on the resistance band exercise machine to overcome a primary (e.g., resistance bands) and secondary (e.g., springs) sources of variably increasing resistance from the cable-pulley variable resistance system.

Abstract: A bracket assembly includes a back plate with outer and inner sides and a pin opening extending therethrough. A clasp member has an extending portion and an encasing portion extending from the extending portion. The extending and encasing portions and the inner side of the body define a channel configured to receive a rack beam. A pin seated in the pin opening has a shank, and a head at the outer side of the back plate. The shank extends through the opening into the channel. The shank is configured to engage the rack beam within the channel. The head is welded to the outer side of the back plate. An extension member defines a support surface and includes pair of substantially J-shaped plates and a cover nested with the plates such that it forms the entire support surface and is substantially flush with sides of the substantially J-shaped plates.

Abstract: An adjustable dumbbell includes a base, a grip, and a plurality of sets of dumbbell plate assemblies connected on both sides of the grip. The dumbbell plate assembly includes a rotating member, an adapter, a limiting member and a weight plate. The rotating member rotates with the grip. The limiting member is located between the rotating member and the adapter. The limiting member fits with and is connected to the adapter in a non-rotatable manner. When the rotating member rotates, the rotating member abuts against the abutting rib to drive the limiting member to translate, so that the protrusion is inserted into or separated from the insertion hole to connect or separate the limiting member and the adapter.

Abstract: The hinged dumbbell holder for a weight bench is configured for use with one or more dumbbells. The hinged dumbbell holder for a weight bench is configured for use with a stanchion of a weight bench. The hinged dumbbell holder for a weight bench attaches to the stanchion of the weight bench. The hinged dumbbell holder for a weight bench forms a supporting structure that elevates the one or more dumbbells above a supporting surface. The hinged dumbbell holder for a weight bench incorporates a mounting bracket, a dumbbell support structure, a hinge, and a rotation assist structure. The stanchion, the dumbbell support structure, the hinge, and the rotation assist structure attach to the mounting bracket. The dumbbell support structure physically receives and elevates the one or more dumbbells. The hinge and the rotation assist structure rotate the dumbbell support structure into a storage position.

Abstract: Disclosed herein is a modular kettle-bell shaped dumbbell having separate, equally weighted dumbbell portions that may optionally be used separately or may be temporarily joined together to form a single kettle-bell shaped dumbbell of twice the weight of the separate, equally weighted dumbbell portions. Each of the separate dumbbell portions may include one part of a two-piece connection system configured to temporarily lock the separate dumbbell portions to one another, with such connectors being configured such that upon achieving a fully engaged locking connection, the exteriors of each body portion of the first dumbbell portion and the second dumbbell portion together form a generally spherical main body portion and an upwardly extending handle having a generally circular cross-section throughout its length.

Abstract: Provided is a weight-adjustable dumbbell, including a grip bar assembly, a dumbbell seat, a plurality of dumbbell discs placed on the dumbbell seat; the grip bar assembly includes a plurality of hanging discs arranged adjacent to each other and are rotated synchronously, and the hanging discs are rotated relative to the dumbbell discs to setting positions to engage with or disengage from the dumbbell discs. The grip bar assembly also includes at least one stopping mechanism, each stopping mechanism includes at least one locking component, and the dumbbell seat is provided with a limiting hole for the locking component to be engaged with. When the hanging discs are rotated to a setting position, the locking component is disengaged from the limiting hole to maintain an unlocked state. When the hanging discs are rotated between two setting positions, the locking component is inserted into the limiting hole to maintain a locked state.

Abstract: An improved exercise equipment including a stationary exercise apparatus, a lever arm pivotably biased about a pivot axis, and a support for supporting the lever arm above the stationary exercise apparatus. The pivot axis extends substantially in a vertical direction. The stationary exercise apparatus is of a type to cause the legs of a user to scissor as the user operates the stationary exercise apparatus. In an exemplary embodiment, the stationary exercise apparatus is a treadmill.

Abstract: An exercise machine which includes a centralized spring box and multiple gripping surfaces with which an exerciser may perform a wide range of exercise moves. The exercise machine includes a movable carriage and platform on a track. Bias members may be connected between the carriage and various structural elements of the exercise machine so as to impart a resistance force against movement of the carriage. An outer handle may be positioned around a carriage platform so as to surround the carriage platform. Inner handles may be positioned between the carriage platform and the outer handle, with the inner handle(s) being connected not to the outer handle or the carriage platform, but to an underlying support assembly. A pair of end handles may extend outwardly from the ends of the exercise machine. A bias member retainer such as a spring box may be centrally-located along the length of the exercise machine.

Abstract: The present invention is directed to a gripping handle that tightens to a hand when pulling force is applied and loosens from the hand when pulling force is not applied. The gripping handle may comprise a dowel, a first and second loop, an attachment point, and a flexible connector running from the attachment point, through the first loop, along the dowel, through the second loop, and back to the attachment point. A portion of the flexible connector running along the dowel may loop over a hand gripping the dowel and may tighten to the hand when the dowel is pulled on. The flexible connector may loosen from the hand when the dowel is no longer being pulled. The present invention additionally features an exercise device comprising the gripping handle attached by a cord running through a pulley component to a weight.

Abstract: An exercise machine with adjustable handles that provide for multiple handle positions. The exercise machine with adjustable handles generally includes a frame with one or more rails, a carriage movably positioned upon the rails, and a pair of adjustable handles positioned near an end of the frame. The adjustable handles each have a handle portion that is movably connected to a corresponding handle stanchion to pivot from a storage position to an extended position.

Abstract: The present invention is a free weight belt squat machine that allows a free, unencumbered raising and lowering of variable resistance by a user. A belt which is directly attached to the horizontal free weight bar holds standard Olympic plates and may be raised or lowered, directly in free space, by the user. Thus, the natural and optimal movement pattern of a straight line over the user's center of gravity may be fully and completely realized. This machine provides a control arm to safely and effectively engage and disengage the resistance from the machine to the user and then back to the machine. This machine further provides an adjustable stopper mechanism for the safety of the user and to limit or expand the range of the exercise to cause the desired adaptations in muscular strength and size.

Abstract: Apparatus is provided for training people in technique and tactics for use in wrestling and other combat sports. The apparatus presented comprises a rigid and elastic frame, padding, low-friction feet or runners, and a platform for another user or weights, to add mass and resistance for the user training with the apparatus. A user may use the apparatus to practice penetration techniques, agility, and strength while training in free motion. The apparatus leads the user to use her or his body weight, the weight of the apparatus, and optionally added weight, in training while on matted surfaces, providing a better training experience and practice than prior art training devices. The present invention solves problems with the currently available means and apparatuses of practicing penetration techniques and tactics.

Abstract: An exercise apparatus is provided for use with a hip belt or short bar for respectively conducting squat or dead lift exercises, comprising at least one elevated platform secured to a rack, a weight holder, and a guide rod and/or other guide. The weight holder may be designed to hold free weights and to attach onto a hip belt or short bar. As the user performs the desired exercise supported by the platform, the guide rod and/or other guide; guides the weight holder as it is lowered into the hole, limiting movement of the weight holder in the horizontal direction.

Abstract: Apparatus is provided for training people in technique and tactics for use in wrestling and other combat sports. The apparatus presented comprises a rigid and elastic frame, padding, low-friction feet or runners, and a platform for another user or weights, to add mass and resistance for the user training with the apparatus. A user may use the apparatus to practice penetration techniques, agility, and strength while training in free motion. The apparatus leads the user to use her or his body weight, the weight of the apparatus, and optionally added weight, in training while on matted surfaces, providing a better training experience and practice than prior art training devices. The present invention solves problems with the currently available means and apparatuses of practicing penetration techniques and tactics.

Abstract: Apparatus for performing an arm extension exercise comprising: a frame, a seat having a seating surface (S), an elbow pad having an engaging surface (ES), an input arm assembly interconnected to a resistance mechanism and a manually graspable mechanism, the input arm assembly being adapted to reside in a start motionless position (SMP) that disposes the manually graspable mechanism in a start exercise position (SEP) that is disposed vertically above UW) the user's elbows, the input arm assembly being pivotable around a linear axis disposed rearwardly of the user's elbow.

Abstract: An exercise machine ergonomic handle system for providing hand-holds for the performance of exercises with reduced flexion and/or extension of the hand and wrist and reduced ulnar and/or radial deviation so as to reduce injury and allow application of full strength to the exercise machine. The exercise machine ergonomic handle system generally includes a longitudinally extending frame, a carriage that moves upon a first longitudinal portion of the frame, and at least one pair of ergonomic handles positioned on a second longitudinal portion of the frame. The ergonomic handles rotate about an axis to prevent flexion and/or extension, and can be positioned at a width and/or angle that reduces ulnar and/or radial deviation.

Abstract: In one aspect of the disclosed embodiments, an exercise device is provided as two similar pedestals, each having an optionally compressible base and a set of feet which interlock within a positioning mat. A set of horizontal outer rails attached to the top of each base and a set of perpendicular inner rails, linearly connected to the outer rails and slidable along the outer rails. A user support platform linearly connected to the set of inner rails and slidable along the inner rails. A plurality of resistance members is provided to supply resistance. The said components of the exercise device provided allow for an exerciser positioned and either partially or totally supported by the user support platforms to propel their body parts being supported in an multi-directional space against resistance. The resistance provided is directed towards a centralized equilibrium position.

Abstract: An exerciser machine including a base frame, a pole frame and a swivel frame is described. The base frame can have longitudinally a head section and a rear section pivotally coupled with the head section. The pole frame can have one or more extendable poles extending longitudinally between a far end and a near end of the pole frame. A cross bar can be detachably affixed between the extendable poles. The pole frame may be pivotally attached to the base frame. The swivel frame can have one or more side bars having longitudinally a handle end and a pole end. A handle bar may be detachably fixed between the side bars at the handle end. The swivel frame may be rotably attached to the extendable poles to allow rotary movements of the swivel frame in between the extendable poles.

Abstract: An exercise device and a method of exercising includes one or more undulation members, such as ropes, which a user undulates, which may cause an elastic line to stretch and/or a travel line to travel around one or more pulleys. The exercise device is configured to allow exercise using undulation members in a relatively small space.

Abstract: As shown in FIG. 1 the exercise machine of the preferred embodiments includes a mechanical force input interface 1 designed to interface with a user 5 and allow the user 5 to input force 4 into the exercise machine; a force resistor 2 that functions to resist force input into the mechanical force input interface 1 by the user 5; and a trigger mechanism 3 that functions to cause a sudden change in the resistance provided against the force input 4 by the user 5. The exercise machine of the preferred embodiments is designed to exercise muscles in a way that improves muscle speed, explosiveness, or both.

Abstract: An apparatus for communicating exercise resistance includes a carriage assembly with at least one upper and at least one lower pulley. First and second cable ends are reeved around the upper and lower pulleys, respectively, and are coupled to a source of selectable exercise resistance. An exercise member is selectively coupled to the two cable ends such that movement of the exercise member away from the carriage is subject to a first exercise resistance when only one of the cable ends is attached and is subject to a second, greater exercise resistance when both cable ends are attached.

Abstract: Exercise apparatus and method with selectively variable stabilization enabling a user to progressively increase his/her core body muscular strength. In various embodiments, the exercise apparatus includes a resistance cabling system providing a user defined line of motion, and a partial stabilizer pad being adjustably positionable offset from the line of motion, wherein the user's core body is positionable against the pad and required to resist the torque created by the offset. The user can progressively increase the distance between the line of motion and partial stabilizer pad, in order to progressively increase the force which the user's core body must resist to maintain an upright stature. In this way, the user can progressively, over time, increase his or her core body strength.

Abstract: Landmine apparatuses include a mounting base and a receptacle for receiving a weight bar. The receptacle is coupled to the mounting base and rotatable about a horizontal axis and in 360 degrees about a vertical axis. A vertical pivot connects the receptacle to the mounting base such that the receptacle is retained in a single horizontal plane while rotating about the vertical axis.

Abstract: An exercise device includes an arrangement of components to strengthen muscles in a physical body of an individual. In particular, the exercise device can be used to perform exercised to strengthen at least abdominal muscles.

Abstract: The present invention is a safety device and method of use that comprises a generally round eccentric disk having a peripheral edge and central rotation axis. The generally round eccentric disk has a barbell access slot extending from the peripheral edge to a seat. A cam lobe is formed with a support base adjacent the cam lobe and opposite the central rotation axis from the barbell access slot. The distance is from the peripheral edge adjacent the slot to the seat is greater than the radius of the barbell weights. Rolling the peripheral edge to orient the cam lobe beneath the seat lifts the barbell above the ground.

Abstract: A physical exercise apparatus is disclosed, and comprises a frame, a seat, a pair of upper arms movably coupled to a first portion of the frame, and a lower arm movably attached to a second portion of the frame. The seat is supported by the frame and configured to support a user in an at least partially supine position. The pair of upper arms is coupled with a common, linearly movable resistance load and is stationary with respect to the seat. The lower arm is coupled with a linearly movable resistance load so that the user can move pair of upper movable arms while separately engaging the lower arm with a portion of his or her lower body.

Abstract: An apparatus providing an assist force to user moved weights of a existing weight exercise or rehab machine or stand can be supplied as a kit including servo motor/transmission/reel assembly. A cable has a first end securable to the reel and a second end configured to be coupled directly or indirectly with the user moved weights of the existing machine/stand. A control interface accepts input of variable parameters for assist control including entry of at least a user selected assist force. The kit also has a servo drive and a main digital controller connected with at least the servo motor, motor drive and control interface, the controller programmed to provide a user selected non-zero assist force essentially only during part of an exercise.

Abstract: An apparatus including a rigid frame structure, a first device for holding a first end of a first weightlifting bar, and a second device for holding a second end of a first weightlifting bar, opposite the first end of the weightlifting bar, is provided. The first device may include a first flexible device and a first retainer device. The second device may include a second flexible device and a second retainer device. The first and second flexible devices can be removably attached to the rigid frame structure. The apparatus provides a safe structure for working out with free weights.

Abstract: A training machine for strength training and rehabilitation comprising pull or press means (10, 11) which are arranged to lift or lower a weight body (30) via connection means and driving means (27) provided to be moved in a continuous cycle by means of a first, by the user intended exerted force towards said pull or press means, to lift said predetermined weight body and by means of a second, by the user intended exerted force towards said pull or press means, to lower said predetermined weight body, wherein said first force is smaller than said second force. The training machine includes a tiltable arm (25) which via links (9, 13, 14, 20), wheels (19, 21, 24) and belts (16, 23) is connected to the handles (10, 11) and in that said weight body (30) provided at or in the arm (25) is arranged to be moved along the arm to predetermined positions depending on the load which shall be exerted on the handles.

Abstract: An apparatus including first, second, third, and fourth vertical members, a first top horizontal member which joins a top of the first and a top of the second vertical members, a second top horizontal member which joins a top of the third and a top of the fourth vertical members, and a third top horizontal member which joins a top of the first top horizontal member and a top of the second top horizontal member. The first, second, third, and fourth vertical members, and the first, second, and third top horizontal members form a cage structure. The apparatus may also include first and second dumbbell holder members adjustably fixed to the cage structure. The apparatus may also include devices for suspending a first and a second dumbbell from the cage structure.

Abstract: A traction apparatus which impresses a desired traction force to a body to be pulled is provided.

Abstract: The power stride apparatus and method therefor is directed to training the quads and gluts. In one embodiment, the apparatus comprises rotatable pedal assemblies having articulating pedals which may be engaged by a user's feet. The apparatus may include a seat to support the user. Resistance devices, such as one or more springs, may attach to the pedal assemblies to provide resistance to the movement of the pedal assemblies and to return to pedal assemblies to their initial position. The user may push the pedal assemblies and resist the return of the pedal assemblies thus training the user's quads and gluts. The articulating pedals allow training to be focused on the quads and gluts and provide a safer workout for the user. In some embodiments, return mechanisms may be used to allow the articulating pedals to follow the rotation of the user's foot during training.

Abstract: A removably supporting mechanism is provided for a workpiece holding device that can hold and release a workpiece. The workpiece holding device is removably supported on a crossbar extending substantially orthogonal to a workpiece conveying direction of a press machine. The removably supporting mechanism has a guide pin and a guide pin hole. The guide pin is fittable into and engageable with the guide pin hole. One of the guide pin and the guide pin hole is disposed on the workpiece holding device side, whereas another of the guide pin and the guide pin hole is disposed on the crossbar side. The guide pin and the guide pin hole can perform alignment of the workpiece holding device and the crossbar in a direction substantially orthogonal to an inserting direction of the guide pin.

Abstract: A low back exercise machine has a pivotally mounted user support frame carrying a user seat and a foot rest assembly, an exercise arm carrying a back pad pivotally mounted relative to the user support frame, and a connecting linkage which translates movement of the exercise arm into rotation of the user support frame about its pivot axis, whereby the user support including the foot rests moves from an upright into a rearwardly reclined orientation as the user pushes the back pad rearward and downward to lean backwards so as to exercise the lower back muscles.

Abstract: A system and method for covering a weight bench is disclosed herein. Specifically, a system can comprise a bench sleeve comprising a bottom surface mountable on a bench and an extended sleeve connected to said bench sleeve, said extended sleeve capable of wrapping said bench sleeve to said bench.

Abstract: A cable end assembly for an exercise machine may comprise a coupler assembly, a cable end, and an eye hook. The coupler assembly may comprise a first coupler connected to a second coupler. The cable end may have a fitting attached to an end, the fitting having an enlarged portion. The enlarged portion of the fitting may be retained within a recess of the first coupler. Additionally, the eye hook may be rotatably coupled to the second coupler. A method of manufacturing a cable end assembly for an exercise machine may comprise attaching a fitting having an enlarged portion to an end of a cable. The method may further comprise inserting the fitting into a recess of a first coupler, rotatably coupling an eye hook to a second coupler, and connecting the first coupler to the second coupler.

Abstract: Embodiments of a user-adjustable resistance mechanism, and embodiments of an exercise apparatus employing such a user-adjustable resistance mechanism, are provided. In one embodiment, the exercise apparatus includes a support structure, a user-manipulated element movably coupled to the support structure and configured to be moved by a user during the performance of an exercise in opposition to an output resistance, and a user-adjustable resistance mechanism. The user-adjustable resistance mechanism includes, in turn, an input resistance assembly and a lever assembly comprising a first plurality of levers rotatably coupled in series between the user-manipulated element and the support structure. The input resistance assembly is configured to be selectively coupled by a user to the lever assembly at any one of a plurality of locations to determine the cumulative load arm length of the first plurality of levers and the output resistance opposing movement of the user-manipulated element.

Abstract: A glute exercise machine has a stationary main frame, a pivotally mounted upper torso support, a knee support, and an exercise arm having a foot support for engaging a user's foot and configured for rotation from a start position by user engaging the knee support with one leg and the exercise arm with the other leg. A connecting linkage translates movement of the exercise arms into rocking movement of the upper torso support. A load is linked to one of the moving parts to provide exercise resistance.

Abstract: Muscle resistance apparatus comprising a framework, at least one resistive force and a movable section. The movable section is linked to a resistive force, wherein a first part of the movable section is attached to the framework by a connection whereby it can be temporarily displaced, and a second part of the movable section is connected to the first part of the movable section by a second connection whereby it can be temporarily displaced. The first and second parts of the movable section are independently movable with respect to one another in an angular and/or linear fashion.

Abstract: A safety device (20) for a gymnastic machine (1) provided with a frame (5) and with a gravitational load group (10) connected to an interface (2) designed to allow a user of the gymnastic machine (1) to perform exercises against the action of the load group (10); the load group (10) comprising a movable equipment (19) provided with at least one load element (11) carried, in a freely sliding manner along a given direction (V), by respective guiding elements (12) associated to the frame (5); the safety device (1) comprising a return group (21) suitable, in use, to exert a given return force (F) on the movable equipment (19) so as to prevent substantially inertial ascending displacements thereof.

Abstract: An exercise machine having a rolling platform and adjustable bar members. The platform is supported on frame rails, and is biased by springs towards an end of the machine. The rails have a rectangular cross-section angled 45° to horizontal, and roller assemblies on the platform include wheels angled to engage the surfaces of the rails substantially normal thereto. The adjustable bar assemblies include upwardly extending bars having upper members that are rotatable about a generally vertical axis so that handle portions at the upper ends thereof extend in different direction. At least one of the bar assemblies is also selectively pivotable about a horizontal axis to positions in which it is engaged by a locking assembly on the frame of the machine. The machine enables the user to perform a wide variety of exercises in reclined, prone, seated and standing positions, both on and off the platform.

Abstract: Disclosed is a weight control apparatus for a weight training machine. The weight control apparatus includes a plurality of stacks which are fitted to a pair of guides standing upright between supports on a base such that the stacks slidably move up and down, and which have rectangular locking holes; a body arranged on a front surface of the base, in which the body has a plurality of insertion holes corresponding to the locking holes of the stacks and is provided at an upper portion thereof with a holder; and a cover arranged on the front surface of the body and having a plurality of locking pin members inserted into the insertion holes.

Abstract: The present invention is a compact exercise apparatus that includes a foundation station frame, a pull down bar that is positioned in front of the foundation station frame, a press bar that is positioned in front of the lower portion of the foundation station frame, a plurality of spotters that are disposed on the foundation station frame and a folding bench that can be folded toward the foundation station frame to allow relatively more compact and easier storage of the apparatus. The apparatus includes an adjustable leg press and calf raise, a plurality of seated rows that are disposed on the adjustable leg press and calf raise, a roller system that is disposed on the foundation station frame and a pair of cables that are attached to the pull down bar and the adjustable leg press and calf raise.

Abstract: Different graphical codes are generated and displayed based upon signals representing different values of an exercise metric of a fitness equipment unit.

Abstract: An apparatus is disclosed for enabling an operator to exercise comprising a frame having a body, a base and a top. A load is positioned on the frame for providing a resistive force. A press is positioned on the frame for displacement by the operator. A linkage joins the load with the press for displacing the load upon displacement of the press by the operator. An arm extends between a support end and a user end. A support pivot secures the support end of the arm to the top of the frame for pivoting the arm about the frame. A user interface inputs and outputs data. A user pivot securing the user interface to the user end of the arm for pivoting the user interface about the arm.

Abstract: A weightlifting system according to an exemplary aspect of the present disclosure includes, among other things, a first frame member that extends along a longitudinal axis, at least one pair of openings disposed along the longitudinal axis. The at least one pair of openings are generally L-shaped and include a first opening and a second opening. A front face is mounted to the first frame member and extending along the longitudinal axis.

Abstract: A dumbbell with a selectable number of weight disks includes a handle with projectable pins in opposing directions, with end surfaces, a base assembly for accommodating two sets of weight disks standing upright, the weight disks having central openings. The projection lengths of the pins are stepwise selectable by an indexing device in order thereby to permit selection of the number of weight disks supported on the handle. Neighboring weight disks and the handle have mutually engaging connecting arrangements which axially interconnect the weight disks and the handle but which permit radial separation. In order to prevent the set projection lengths of the pins from being unintentionally altered, when a dumbbell lifted up out of the base assembly is used, the handle has a locking arrangement which locks the pins in the set projection positions.

Abstract: A barbell positioning system featuring a frame with a set of weights attached to a pulley positioned in the back of the frame, the pulley extends forwardly and connects to two sliding bases slidably attached to the front posts of the frame. Two resting bases are temporarily attached to the front posts below the sliding bases. The sliding bases are adapted to pivot when the sliding bases come in contact with the resting bases. When a barbell is placed on the sliding bases, the sliding bases slide downwardly and contact the resting bases whereupon the resting bases pivot the sliding bases causing the barbell to be dumped from the sliding bases to the resting bases.

Abstract: A limb-exercising system for attaching to an office swivel chair on castors, the limb-exercising system including a rigid platform, at least one interchangeable limb-exercising unit, a force resistor, and a cable, the rigid platform being coupled with the castors of the office swivel chair, such that the relative movement between the rigid platform and the office swivel chair is minimal, the interchangeable limb-exercising unit being coupled with the rigid platform, the interchangeable limb-exercising unit being operative to provide movement exercise for at least one muscle group of the body of a user, the force resistor being coupled with the rigid platform and with the interchangeable limb-exercising unit, the force resistor providing resistance to movement of the interchangeable limb-exercising unit, the cable being coupled between the interchangeable limb-exercising unit and the force resistor.