Abstract: A body exerciser includes an elongated base, a pulley member, a pair of swing arms and an elastic band. The base has an upright support extending upwardly therefrom. A seat is disposed on and projects forwardly of the upright support. An inverted T-shaped member has an upper upright portion and a lower horizontal portion. The upper upright portion has a top distal end connected pivotally to a top distal end of the upright support for turning forward and upward from a vertically suspended position. The pulley member is mounted on the upright support rearwardly of the lower horizontal portion and below the top distal end of the upper upright portion. The swing arms are connected pivotally and respectively to end portions of the lower horizontal portion so as to move forwardly toward one another.

Abstract: A shoulder press exercise apparatus is provided. The shoulder press apparatus includes a selectable weight mechanism and a support member which pivotably supports a pair of four-bar linkage mechanisms. The four-bar linkage mechanisms are pivotably mounted at their rearward ends about axes which are disposed at an angle relative to a horizontal plane, i.e. are tilted relative to vertical, such that a pair of elongated bars of the four-bar linkage mechanisms travel in planes which are tilted relative to vertical. The tilted planes through which the four-bar linkage mechanisms travel enable the handles to travel along a slightly curvilinear downwardly diverging path which simulates as natural a human musculoskeletal upward pushing motion as possible.

Abstract: The invention relates to a shoulder press machine having a seat, a backrest and fixed framework at the top of which a carriage is mounted. The carriage has a pair of downwardly and forwardly extending, diverging lever arms which are tied together and moved upwardly and downwardly along a major horizontal axis mounted to the framework behind the backrest and a minor horizontal axis offset behind and parallel to the major horizontal axis. As the lever arms are moved together upwardly, they are simultaneously swung inwardly about a pair of parallel, angular pivot axes, the swinging motion being transferred via a pair of transfer links to pivot a pair of sleeves about the minor horizontal axis. As a result of these linkages, a shoulder press machine is provided in which an exerciser's hands rotate or supinate naturally through approximately 20.degree.-30.degree. as the lever arms are pushed upwardly.

Abstract: An exercise machine has a pair of exercise arms pivotally coupled to the frame for use by the operator in performing a triceps press exercise. The exercise arms are coupled to the frame for rotation about two spaced-apart, generally horizontal axes. One axis is fixed with respect to the frame, while the second axis is fixed with respect to the exercise arms. A linkage member pivotally coupled to both the frame and the exercise arms connects the two axes of rotation. Exercise resistance is provided by weights, although other sources of exercise resistance may be used. The selected exercise resistance is transmitted by a flexible belt and pulley system to a cam attached to a cross member connecting the two exercise arms. A second belt is attached between the cam and the frame to control the movement of the cam within a vertical plane.

Abstract: An exercising machine includes a sliding sleeve slidably mounted on an upright post fixedly mounted on one end portion of a base, at least one supporting strut mounted on a mediate portion of the base, a seat fixedly mounted on an upper end portion of the sliding sleeve, and an arm training mechanism. The arm training mechanism includes a connecting rod rotatably mounted on the supporting strut, two handles each having a lower end portion detachably attached to one end portion of the connecting rod for rotating the connecting rod along a horizontal axis, a drive lever having a first end fixedly mounted on a mediate portion of the connecting rod, an intermediate lever having a first end pivotally connected with a second end of the drive lever, and a driven lever having a first end pivotally connected with a second end of the intermediate lever and a second end fixedly mounted on a lower end portion of the sliding sleeve.

Abstract: A resistance mechanism for an exercising device includes a frame, a bi-directional electric motor installed on the frame and provided with an output axle, a pulley fixedly mounted on the output axle and formed with two parallel circular grooves, an idle wheel rotatably arranged on the frame, a first belt having one end connected with one of the grooves of the pulley and wound thereon in a direction, a second belt having one end connected with another one of the grooves of the pulley and wound thereon in an opposite direction and engaged with the idle wheel, and an oscillating arm having one end pivotally connected with the axle of the exericsing device and another end fixedly connected with another end of the first belt and another end of the second belt, whereby a resistance force will be applied to the axle when the electric bi-directional motor is turned on.

Abstract: An apparatus and a method for performing a chest press exercise are disclosed. A user support and a primary hinge are mounted to a frame. A secondary hinge is mounted to the primary hinge. An arm mounted to the secondary hinge has a handle adapted to be grasped by the user. The two hinges permit the user to displace the handle in either or both the longitudinal and lateral directions. A means for resisting the displacement of the handle, preferably in both the lateral and longitudinal directions, is provided. The resistance means may include a post attached to the arm for mounting weight plates. A second handle, arm, and secondary hinge may be provided for the other hand so that the user may exercise both halves of his body. The arms may be connected such that both handles move the same longitudinal and/or lateral distance.

Abstract: An exercise machine has a frame that has a base with an upright member. The upright member is formed to have a race to receive wheels to interconnect a second frame to the upright member. A cable and pulley structure interconnects exercise structures to cause movement of the second frame relative to the first frame. A user is positioned on a seat connected to the second frame to resist movement of the second frame relative to the first frame. A butterfly structure is provided that has a mechanical linkage to interconnect the link arms to a butterfly lever rotatably connected to deflect the cable of an associated cable arrangement.

Abstract: An exercise apparatus comprises a frame (1), a loading assembly (2) for variable adjustment of the rotation resistance about a shaft (3) associated with the assembly, and a gripping device (8) connected to the shaft. In the exercise apparatus according to the invention, the gripping device (8) is part of a series of such devices. Coupling means (9, 10) are arranged for quick-release coupling of the different gripping devices (8) to the shaft (3) in the loading assembly (2), which by frictional engagement generates the rotation resistances, which are independently adjustable in the two directions of rotation (6, 7) of the shaft (3).

Abstract: An exercise machine has a base with an upright frame. A carriage is movable along the length of the frame and connectable thereto by a pin which registers with apertures formed in the frame. The pin is connected to a bridge with spans between cheek plates of the carriage. A lever structure and a butterfly exercise structure are pivotally secured to the carriage. Resistance modules are connectable to the carriage and the lever structure and the butterfly exercise structure to resist movement. A bench is provided for the user and is connected at one end to one frame. A stepper exercise assembly is also attached to the frame. A stepper has hydraulic resistance cylinders which include springs to urge the treadles in an upward direction.

Abstract: A portable exercise device for use by individuals without supervision to follow prescribed or desired therapeutic exercise regimens is provided. The portable exercise device preferably includes two pulley assemblies, mounted and secured to individual `O` clamp assemblies, interconnected by a flexible cord, with bayonet clips secured at both ends of the cord, and supplemented with hand grip, precision straight scale and a dual purpose knee flex and anchoring harness. The `O` clamp screw and pressure plate assembly may be disassembled and employed in either of two clamp screw holes. One pulley assembly is preferably configured with one grooved roller and functions as a pilot pulley. The second pulley assembly is configured with two grooved rollers and includes a cord locking mechanism to permit cord travel in one direction while resisting travel in the opposite direction.

Abstract: A method and apparatus for exercising the rear deltoid muscle is disclosed. The apparatus comprises a seat and a chest pad that are adjustably mounted to a frame to form a user support. Two arms are independently pivotally mounted at a first end by hinges to the frame. A handle is mounted to each arm whereby an exerciser grips the handle to use the apparatus. A means for resisting the movement of the handle is provided which is adapted to affect the force required to move the handles. According to the method, a seated exerciser grasps at least one handle and moves it outwardly and pulls it towards himself so that the handle moves in a substantially arcuate path towards the exerciser's shoulders.

Abstract: An apparatus and a method for performing a shoulder press exercise are disclosed. A user support and a primary hinge are mounted to a frame. A secondary hinge is mounted to the primary hinge. An arm mounted to the secondary hinge has a handle adapted to be grasped by the user. The two hinges permit the user to displace the handle in either or both the longitudinal and lateral directions. A means for resisting the displacement of the handle, preferably in both the lateral and longitudinal directions, is provided. The resistance means may include a post attached to the arm for mounting weight plates. A second handle, arm, and secondary hinge may be provided for the other hand so that the user may exercise both halves of his body. The arms may be connected such that both handles move the same longitudinal and/or lateral distance.

Abstract: A universal gym includes a frame assembly, a resistance assembly, a lever-type strain gauge, and a plurality of exercising assemblies the resultant resistances of which are identical under proper arrangement of a plurality of movable pulleys and fixed pulleys.

Abstract: An articulated physical therapy device used in the therapy of a frozen shoulder is provided with tensioning means. In the preferred embodiment of the device there is a reciprocating strut employing rods and plates enclosed in a tube. The preferred embodiment can also be provided with a cam-operated detent for easy adjustment of the length of the forearm strut. Means are provided for easy removal of the reciprocating upper arm unit. A detent and keeper are provided for convenient changing of the reciprocating unit from the left side protractor retainer to the right side protractor retainer.

Abstract: An apparatus and a method for performing a chest press exercise are disclosed. A user support and a primary hinge are mounted to a frame. A secondary hinge is mounted to the primary hinge. An arm mounted to the secondary hinge has a handle adapted to be grasped by the user. The two hinges permit the user to displace the handle in either or both the longitudinal and lateral directions. A means for resisting the displacement of the handle, preferably in both the lateral and longitudinal directions, is provided. The resistance means may include an incremental weight stack operably engaged to handle by belts directed by self-aligning pulleys. A second handle, arm and secondary hinge may be provided for the other hand so that the user may exercise both halves of his body. The arms may be connected such that both handles move the same longitudinal and/or lateral distance.

Abstract: An apparatus and a method for performing a rear deltoid and rowing exercise are disclosed. A user support and a primary hinge are mounted to a frame. A secondary hinge is mounted to the primary hinge. An arm mounted to the secondary hinge has a handle adapted to be grasped by the user. The two hinges permit the user to displace the handle in either or both the longitudinal and lateral directions. A means for resisting the displacement of the handle, preferably in both the lateral and longitudinal directions, is provided. The resistance means may include an incremental weight stack operably engaged to handle by belts directed by self-aligning pulleys. A second handle, arm and secondary hinge may be provided for the other hand so that the user may exercise both halves of his body. The arms may be connected such that both handles move the same longitudinal and/or lateral distance.

Abstract: An apparatus and a method for performing a lat pulldown exercise are disclosed. A user support and a primary hinge are mounted to a frame. A secondary hinge is mounted to the primary hinge. An arm mounted to the secondary hinge has a handle adapted to be grasped by the user. The two hinges permit the user to displace the handle in either or both the longitudinal and lateral directions. A means for resisting the displacement of the handle, preferably in both the lateral and longitudinal directions, is provided. The resistance means may include an incremental weight stack operably engaged to the handle by belts directed by self-aligning pulleys. A second handle, arm and secondary hinge may be provided for the other hand so that the user may exercise both halves of his body. The arms may be connected such that both handles move the same longitudinal and/or lateral distance.

Abstract: An apparatus and a method for performing a shoulder press exercise are disclosed. A user support and a primary hinge are mounted to a frame. A secondary hinge is mounted to the primary hinge. An arm mounted to the secondary hinge has a handle adapted to be grasped by the user. The two hinges permit the user to displace the handle in either or both the longitudinal and lateral directions. A means for resisting the displacement of the handle, preferably in both the lateral and longitudinal directions, is provided. The resistance means may include an incremental weight stack operably engaged to handle by belts directed by self-aligning pulleys. A second handle, arm and secondary hinge may be provided for the other hand so that the user may exercise both halves of his body. The arms may be connected such that both handles move the same longitudinal and/or lateral distance.

Abstract: An abductor machine has a pair of movement arms including thigh pads engageable by the user's thighs to move the movement arms outwardly about vertical axes while the user is seated with the thighs located between the thigh pads. The movement arms are connected to a weight stack by a transmission including connecting rods interconnecting the movement arms and a cam, and a cam follower which is connected to an actuating lever which in turn drives the weight stack pin. The lateral position of the thigh pads is adjustable to suit the size of the user's thighs. The thigh pads are also self-adjustable about vertical axes. An adjustable backrest is also provided to change the posture of the user so that the exercise may be concentrated on different portions of the abductor muscles. Once adjusted, the backrest is locked in position.

Abstract: An adductor machine including a pair of movement arms movable about a vertical axes between an open position extending laterally from the seat and a closed position extending forwardly of the seat. The movement arms are movable to the closed position by the user engaging with the inner sides of his thighs, pads respectively located on the movement arms. Movement of the movement arms is transmitted to move a resistance in the form of one or more weights in a weight stack. Such transmission is accomplished by a linkage and cam follower arrangement operatively connected between the movement arm and a weight stack pin included in the resistance weight stack. An auxiliary actuating mechanism is provided to move the movement arms between the open and closed positions independently of engaging the pads with the legs. This actuating mechanism includes a handle engageable with the cam included in the transmission to operate the cam independently of a linkage which extends between the movement arms and the cam.

Abstract: An exercise apparatus for exercising the adductor muscles of the legs includes an adjustment mechanism for adjusting the angular starting positions of the leg receiving assemblies. The exercise apparatus includes a base, two support legs which extend outwardly from opposite sides of the base, a seat on the base, and two leg receiving assemblies for receiving the legs of a user seated on the seat. The leg receiving assemblies are pivotably mounted to the base so that they are pivotably movable between a spread apart position and a parallel, together position. The apparatus further includes a cabled weight assembly for normally urging the leg receiving assemblies toward the spread apart position. The cabled weight assembly includes a stack of weights connectable to an apertured weight bar.

Abstract: The herein disclosed invention is directed to an articulated physical therapy device used in the therapy of a frozen shoulder. The device can be provided with tensioning means which facilitate exercise.

Abstract: A body building station includes three juxtaposed posts extending downwardly from the underside of a securing seat of a seat of a frame. The side posts are pivotally connected to two rocker arms along the front side of the frame to form a leg exercising mechanism, while the central post is pivotally connected to a rotary frame at the rear side of the frame to form a twisting mechanism. Both tips of the rotary frame are connected to a bent press bar to form an abdominal exercising mechanism. Rubber resistance elements may be selectively positioned at suitable locations of the frame to facilitate the carrying out of different exercises.

Abstract: A leg press includes an adjustable foot-rest structure provided near the bottom of a front erect column of a main body for the user to rest his feet thereon as a pivot when doing scissors exercises of the thighs. Two separate cushions are provided on top of two corresponding swing arms. The cushions may synchronously move with the user's thighs to reduce the load of the legs' weight in exercising.

Abstract: A multi-station exercise machine frame structure comprising a base support assembly which supports a number of columns for accommodating individual exercise units or stations. The base support assembly is constructed of cross beams connected between bottom parts of associated columns. Expansion of the machine to include one or more additional exercise units or stations is accomplished by adding corresponding columns and connecting additional cross beams of similar construction. In another aspect, a module for a butterfly unit is provided which comprises tilted inlet and outlet pulleys to facilitate a smooth operation of pivoting rods in performing a butterfly exercise.

Abstract: A device for exercising the user's thigh, back, abdomen, and arm muscles. The device consists of a stand which supports two struts that are arranged in the shape of a "V". Resistance to movement of the struts is provided by a spring element connected to the first and second struts at respective first and second connections points. At least one of the connections points is adjustable along the length of its respective strut.

Abstract: The exercise apparatus is for supportively aiding a patient's therapeutic upper limb movements and rehabilitation of those corresponding muscles. A skeletal frame has two exercise assemblies mounted on it. Each exercise assembly has a substantially horizontal boom, a first weight resistance assembly in depending relationship to the rearward end of said boom, a flexible connecting line extending from the first weight assembly and then along the boom to a sling for a patient's upper limb, and a depending leg to which the boom is pivotally mounted at its rearward end for pivot swinging adduction and abduction movement of the boom. An adjustable stop system is associated with the boom pivot mounting and permits step-wise setting of stop limits for the adduction and abduction pivot swinging movement of the boom. The flexible connecting line does not extend across the axis for the pivot of the boom. Color coded connecting lines for different slings and weight assemblies are used.

Abstract: An improved muscle exercise and rehabilitation apparatus, which includes a rotary actuator mounted for linear movement along a longitudinal path of movement, and a seat assembly which is mounted for movement along a lateral path of movement, and with the longitudinal path disposed on one side of the lateral path and having one end which intersects the lateral path at a medial location along the length of the lateral path. Also, the rotary actuator is mounted so as to be laterally offset from its supporting post so as to permit the actuator to rotate a full 360.degree. about a vertical axis, and a full 360.degree. about a horizontal axis. The resulting flexibility in the orientation and positioning of the components of the apparatus permits the apparatus to be readily configured to perform a variety of exercising routines, including gravity eliminated exercises. A novel automatic positioning system for the seat assembly and actuator is disclosed, and a novel patient stabilizing system is also disclosed.

Abstract: An exercise machine has a frame, a seat and a pair of articulated exercise arm assemblies. Each of the exercise arm assemblies is pivotally attached to the frame with a four bar linkage. Handles at the outer extremities of the articulated arm assemblies are gripped by the user to perform the intended exercise. The geometry of the arms and their pivot points is arranged so that the handles of the articulated assemblies follow arcuate paths which converge as the handles are moved forwardly. At a starting position for a press exercise, the handles are approximately in line with the shoulders of the user. As the handles are pushed forwardly against an exercise resistance, they converge inwardly until they are nearly touching when the user's arms are fully outstretched. The machine may also be used to perform a seated-row exercise, in which case the handles are pulled rearwardly against the exercise resistance.

Abstract: An exercise apparatus includes a plurality of exercise stations, each of which exercises particular muscle groups of the body. Each exercise station is continuously coupled to a common stack of weights, a selectable number of which provide resistance to a user's operation of a selected exercise station. At least one of the exercise stations is coupled to the weight stack through a lever arm. A plurality of lever arms may be provided and mechanically interconnected so as to couple a plurality of exercise stations to the weight stack.

Abstract: Method and apparatus for exercising the muscles of the upper legs and lower torso wherein the exerciser is placed on his/her side in a generally horizontal position on a support including a movable portion which rotates about a vertical axis in response to forces generated by the exerciser. At least two vertically extending pads are secured to the movable support portion to receive the exerciser therebetween. The pads serve to position and retain the exerciser as well as to transmit forces from the exerciser to the movable support portion to rotate the same. A weight stack is connected to the rotatable support portion by a drive mechanism located below the support portion and connected to the bottom of a weight rod included in the weight stack. During the exercise, the movable support portion is rotated by the exerciser from a start position in one direction against the resistance of the weight stack and then returned to the start position whereupon the exercise is repeated.

Abstract: An improved head, neck and shoulder apparatus is provided which can be utilized for exercise and/or therapy of the cervical spine and/or muscles associated with the cervical spine. The machine includes a head frame which receives a person's head, and a main frame which can receive a person in a seated position. A ball joint is provided for allowing relative movement of the head frame with respect to the main frame, with the ball joint positionable such that it can be located adjacent a desired location along the person's cervical spine, preferably at the cervico thoracic junction. Various aspects of the invention are also applicable to exercise machines designed for conditioning other muscles and/or muscle groups.

Abstract: An exercise dynamometer permits a patient to exercise against isodynamic, isokinetic, or isometric resistance to evaluate various musculoskeletal conditions of the patient's human spine. Sensing means are provided to determine the positioning of the patient, and to determine the angular position, velocity, and torque of the exercise movements. In a first embodiment, the patient's head, trunk, upper legs, knees, and feet are secured to a lumbar dynamometer to isolate lumbar and lower thoracic spinal rotation, flexion-extension, and/or lateral bending. During rotational exercise, the axis of movement of the dynamometer is coincident with the patient's spine. In a second embodiment, a patient's trunk and hips are secured to a neck dynamometer to restrict exercise to the cervical spine. The invention facilitates forward flexion-extension, or alternatively lateral bending of the cervical spine, about a first axis aligned with the patient's C1-C2 vertebrae and a second axis aligned with the patient's C7 vertebra.

Abstract: An exerciser including a generally horizontal top frame having a front end, a column supporting the top frame, a movable frame mounted on the top frame and movable between the front end of the top frame and the column, the movable frame having two spaced vertical hollow frame sections and a cross frame section interconnecting lowermost ends of the vertical hollow frame sections, two push arms connected privotally to the movable frame and capable of being pivoted toward each other, and a stop rod extending frontward from the column below the top frame so as to limit movement of the movable frame toward the column. The exerciser further includes a first locking unit which is operable to prevent movement of the movable frame relative to the top frame and a second locking unit which is operable to prevent movement of the push arms relative to the movable frame.

Abstract: The golf swing training and exercising apparatus, including a base platform, upright housing and rotating parabolic arm connected between a simulated golf grip and a resistant source, which enables a golfer to execute a simulated golf swing by rotating the arm against the resistance. The structure includes a linkage which permits rotation of the arm in either the backswing or downswing direction, and against the resistance, enabling a golfer to exercise each group of muscles associated with the particular backswing and downswing movements, respectively.

Abstract: Method and apparatus for exercising the muscles of the upper legs and lower torso wherein the exerciser is placed on his/her side in a generally horizontal position on a support including a movable portion which rotates about a vertical axis in response to forces generated by the exerciser. At least two vertically extending pads are secured to the movable support portion to receive the exerciser therebetween. The pads serve to position and retain the exerciser as well as to transmit forces from the exerciser to the movable support portion to rotate the same. A weight stack is connected to the rotatable support portion by a drive mechanism located below the support portion and connected to the bottom of a weight rod included in the weight stack. During the exercise, the movable support portion is rotated by the exerciser from a start position in one direction against the resistance of the weight stack and then returned to the start position whereupon the exercise is repeated.

Abstract: Method and apparatus for exercising the lumbar muscles including a movement arm which is moved about either a vertical or a horizontal axis depending on how a support for the movement arm is oriented relative to a primary support. In one position of the support the movement arm is moveable about a horizontal axis with the person seated in a generally upright position while in another position of the support, the movement arm is moveable about a generally vertical axis with the person positioned on his/her side. During exercise, the position of the persons head is fixed relative to the movement arm, and the pelvis is also fixed against movement.

Abstract: A rowing exercise machine includes a frame, a seat and a chest brace supported by the frame, and a pair of levers pivotally connected to the frame in front of the brace and seat. Each of the levers has a lower end adapted to support at least one removable weight and a handle at an upper end adapted to be grasped by an exerciser supported on the seat. During the performance of a rowing exercise, the exerciser pulls the handles upwardly and rearwardly to pivot the levers against the weight resistances held by the lower ends. The levers move along two outer vertical planes that converge with respect to the forward direction of the seat, and each of the levers pivots independently with respect to the frame.

Abstract: A convertible gymnastic apparatus for doing push-lift movement or chest building movement makes use of a short cross bar having thereon a protruded bar extending upwardly and a swing frame comprising a longitudinal bar, to which a movable body is attached, and two gyrating arms having a baffle disposed at inner side end thereof. As movable body is moved upwardly, the movement of the baffle of gyrating arm is obstructed by the bump of the movable body so that the gyrating arm can not be rotated. Therefore, the user can do the push-lift movement. As movable body is moved downwardly, the protruded bar of the short cross bar is locked securely into the hole of the movable body, thereby resulting in prevention of the swing frame from swinging forward and allowing the user to do the chest building movement.

Abstract: Method and apparatus for testing and/or exercising the rotary neck muscles which are used to twist or turn the neck from side-to-side about a generally vertical pivot axis passing through the cervical vertebrae. The head is held by and between a pair of pads mounted on a rotatable frame fixed to a movement arm in the form of a vertical pivot shaft rotatable about the pivot axis. The movement arm is connectable to resistance weight stack to oppose pivotal movement of the movement arm in one direction. During exercise, the subject is seated against a backrest with a front pad assembly immobilizing the chest and shoulder areas of the subject. Additionally, the head pads prevent forward and rearward movement of the neck in extension and flexion so that only the rotary torsion muscles of the neck are exercised.

Abstract: Method for exercising or testing the rotary torso muscles in which the chest and shoulder area of the subject is secured against movement while the pelvis is also secured against movement to isolate the rotary torso muscles for testing or exercise. The subject while so secured and seated exerts a force with the rotary torso muscles to rotate a movement arm about a vertical axis against a resistance suitably chosen from a weight stack to be less than the maximum static strength of said muscles. The subject then returns to the starting position and repeats the exercise until the rotary torso muscles can no longer rotate the movement arm. The subject's static strength is measured by fixing the movement arm in several different angular positions and measuring the force exerted by said muscles on the movement arm in each of said positions.

Abstract: An exercise apparatus for performing a variety of exercises, including chest and incline shoulder press exercises during which the user sits on a seat with a backrest which is adjustably secured in upright and forwardly inclined positions for supporting the user's upper body in the proper positions for these exercises. The exercises all utilize the same weight stack or other device for resisting the exercise motions of the user. The apparatus has a plurality of exercise members mounted on a frame for different prescribed exercise movements by the user, a resisting force producing arrangement, and a cable for selectively connecting the resisting force to the different exercise members. The cable is guided and supported by pulleys, one of which is adjustable from one position to another to accommodate the different exercises.