A preloaded resistance pack and exercise device. The resistance pack includes an elastomeric resistance element coupled to a hub and disposed on a plate. The hub includes a pair of radially extending wings that lie against a surface of the plate. The plate includes a pair of raised tabs that lie within a rotational path of the wings. An initial rotation of the hub relative to the plate causes the wings to slide over and beyond the raised tabs and at least partially stretches the resistance element. Interaction between the tabs and wings prevents the hub from rotating back to an initial position and maintains the resistance element in a preloaded, tensioned condition. The exercise device is configured to detect a number of the resistance packs coupled thereto as well as data associated with exercise movements employing the resistance packs.

An upper limb exercise apparatus comprises a base, a frame, and a display mounted on the frame. The apparatus further comprises 5-bar linkage-type movable parts positioned on the display and including a first link and a second link. The first link comprises a 1-1 member having one end attached to the frame and being rotationally driven, and a 1-2 member having one end rotatably attached to the other end of the 1-1 member, the other end having attached thereto a handle for gripping. The second link comprises a 2-1 member having one end attached to the frame and being rotationally driven, and a 2-2 member having one end rotatably attached to the other end of the 2-1 member, the other end having attached thereto the handle and the other end of the 1-2 member. Series elastic actuators attached to the 1-1 member and the 2-1 member provide torque.

A handheld resistance exercise device is contemplated for exercise, rehabilitation, warm-up and the like, which provides resistance to muscles, tendons, joints, and fasciae in the upper body and lower back as it is actuated by a user standing a distance away from a vertical surface that is engaged with the device. Actuation thereof by the user in performing various exercise protocols provides stability for one or more muscles of the hand, elbow, shoulder girdle, shoulder blade, rib cage, as well as the inner core muscles, while also providing improved mobility for one or more of the wrist, forearm, elbow, shoulder joint, and muscles that rotate and bend the spine sideways.

In one aspect, an active exercise chair comprising seat support, wherein the seat support is rigidly affixed to a top section of a shaft of the gas spring; a seat, wherein the seat is connected to the seat support; a seatback support, wherein the seatback support is pivotably connected to the seat support about a discrete pivot point; a seatback carriage, wherein the seatback carriage is slidably connected to the seatback support, wherein the seatback carriage is connected to a seatback, and wherein the seatback traverses a translational path defined by the geometry of the seatback carriage and the seatback support.

In one aspect, an active exercise chair comprising seat support, wherein the seat support is rigidly affixed to a top section of a shaft of the gas spring; a seat, wherein the seat is connected to the seat support; a seatback support, wherein the seatback support is pivotably connected to the seat support about a discrete pivot point; a seatback carriage, wherein the seatback carriage is slidably connected to the seatback support, wherein the seatback carriage is connected to a seatback, and wherein the seatback traverses a translational path defined by the geometry of the seatback carriage and the seatback support.

A core muscle exercising and resistance training device includes a weighted bar having opposed bar ends adapted to removably mount at least one weight or other force generating element. A pad element is removably and frictionally mounted on the bar, the pad element being constructed from a lightweight foam material having a density within a specific range. The pad has an outer surface with a radius of curvature substantially the same as a normal cervical curvature. In use, the outer pad surface is placed adjacent a user's cervical curve and the weighted bar, the additional isometric resistance generating elements and the pad element act in combination to apply a force upon the user's core cervical curve muscles for improving the user's cervical curve posture by gradually modifying the cervical curvature to conform with clinically desirable curvature.

A core muscle exercising and resistance training device includes a weighted bar having opposed bar ends adapted to removably mount at least one weight or other force generating element. A pad element is removably and frictionally mounted on the bar, the pad element being constructed from a lightweight foam material having a density within a specific range. The pad has an outer surface with a radius of curvature substantially the same as a normal cervical curvature. In use, the outer pad surface is placed adjacent a user's cervical curve and the weighted bar, the additional isometric resistance generating elements and the pad element act in combination to apply a force upon the user's core cervical curve muscles for improving the user's cervical curve posture by gradually modifying the cervical curvature to conform with clinically desirable curvature.

An exercise machine resistance adjustment system for providing an exerciser the ability to immediately adjust the resistance force by changing their body position on the movable carriage or end platforms. The exercise machine resistance adjustment system generally includes a frame, a carriage movably positioned on the frame, a spring connected to the carriage to apply a biasing force to the carriage, one or more left projections within the carriage adapted for a left hand of an exerciser to grasp, and one or more right projections within the carriage adapted for a right hand of an exerciser to grasp. The exerciser is able to efficiently adjust the amount of resistance force applied to the carriage by repositioning their hands (or feet) from a first set of projections at a first distance to a second set of projections at a second distance from the first end of the exercise machine.

A force measurement device has a motion dampening device having at least two ends. A first end is releasably engaged to a base frame and a second end is releasably engaged to a moveable member. A load cell is in communication with the motion dampening device. The load cell measures a force imparted by a user and the load cell registers the force to a display which depicts the registered force exerted by the user. A method for measuring the force a user imparts onto an exercise apparatus comprises the user imparting force onto a moveable member. The motion dampening device imparts a force substantially opposite to the user force and a load cell measures the force exerted by the user. The force is transmitted to a display wherein the display depicts the registered force imparted by the user.

Disclosed is a multifunctional muscle exerciser comprising two handles (1, 2). The two handles (1, 2) each comprise a connection end (1a, 2a) and a grip end (1b, 2b). A torsional spring (3) is connected between the connection ends (1a, 2a) of the two handles (1, 2). The torsional spring (3) is composed of stacked multichip spring steel pieces (31). The two ends of the multichip spring steel pieces (31) are respectively connected via fasteners. Preferably, both of the two handles (1, 2) are U-shaped. The connection ends (1a, 2a) of the two handles (1, 2) are coaxially arranged. The grip ends (1b, 2b) of the two handles (1, 2) are in parallel but are not on the same straight line.