A treadmill has a front or rear set of pulleys and a looped running belt. The pulleys rotate with the movement of the belt, e.g., when a user walks, jogs, or runs on the treadmill. The pulleys are mounted on a rotating roller tube so that the roller tube rotates with the pulleys. The roller tube is mounted on a stationary shaft using bearings on each side and a one-way device that allows the pulleys to rotate in one direction. The rotation direction corresponds to the movement of the top of the belt from the front to the rear of the treadmill. The one-way device prevents the pulleys from rotating in the opposite direction, preventing the top of the belt from moving from the rear of the treadmill to the front. The one-way device may be a sprag clutch. The treadmill may be a motor-less, curved treadmill.

A lower limb exercise system exercise system includes a chair including a seat and a rowing exercise device configured to enable a user to perform rowing exercise while the user remains sitting on the seat. The seat is configured to at least roll, pitch, or yaw. The seat can instead be configured to at least roll and yaw. The rolling of the seat indicates that the seat descends as the seat moves away to the right or the left from a reference position.

A treadmill has a front or rear set of pulleys and a looped running belt. The pulleys rotate with the movement of the belt, e.g., when a user walks, jogs, or runs on the treadmill. The pulleys are mounted on a rotating roller tube so that the roller tube rotates with the pulleys. The roller tube is mounted on a stationary shaft using bearings on each side and a one-way device that allows the pulleys to rotate in one direction. The rotation direction corresponds to the movement of the top of the belt from the front to the rear of the treadmill. The one-way device prevents the pulleys from rotating in the opposite direction, preventing the top of the belt from moving from the rear of the treadmill to the front. The one-way device may be a sprag clutch. The treadmill may be a motor-less, curved treadmill.

An exercise device with a redundant monitoring and control circuit integrated within or otherwise in communication with various components of the exercised device to detect and act on real or possible improper operation of the exercise device. A redundant controller may, based on a determination of a potentially out of specification operating condition of the exercise device, transmit one or more control signals to alter (e.g., reduce or remove) power to the motor of the exercise device. The redundant controller may provide a control signal to a motor power gating device to remove power transmitted to the motor from a power source and/or enable an inhibitor line of a motor controller to disconnect main power from the motor. Controlling the motor power gating device and the inhibitor line may ensure that power is removed from the motor even when a conflicting signal is being transmitted to the motor.

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.

A range of motion limiting device, in one example comprising a first armature configured to engage a carriage moving on at least one rail having a first surface and a second surface transversely offset from the first surface of the rail. Also disclosed is an example utilizing a first bumper adjacent the first longitudinal end of the first armature. The first bumper extending transversely from the first transverse side of the first armature, optionally having a distal end with a non-slip surface engaging the first surface of a rail. Also disclosed is a second bumper longitudinally offset from the first bumper on the first armature, the second bumper extending transversely from the second transverse side of the first armature, also optionally having a distal end with a non-slip surface engaging the second surface of the rail.

A compressible barbell adapter is disclosed, which consists of a compression-retraction member fastened to a hollow shaft for use on a bar. The compression and retraction movement of the compression-retraction member is generally achieved by means of a pinion and a rack system, and can be utilized in conjunction with dampening means. Slidable handles are also connected to the compression-retraction member, and serve to slide along the axis of the hollow shaft, and thus along the bar. The compressible barbell adapter is meant to be fastened onto existing bars or barbells such that additional exertion is focused on the pectoral, deltoid and back muscles during various exercises.

An arm exercise apparatus is disclosed which includes a substantially rigid framework having a stand supporting a first, a second and a third frame member, a rod flexibly coupled to the first frame member at a vicinity of a first end of the rod, the rod having a second end opposite to the first end for being held by a user's hand during an exercise, a first elastic band coupling the rod at a predetermined location to the second frame member, the predetermined location being between the first end and the second end and having a predetermined distance to the first end, the first elastic band exerting a first force at the rod, and a second elastic band coupling the rod to the third frame member, the second elastic band exerting a second force at the rod countering the first force, wherein the rod is statically suspended in a space between the second and the third frame member.

A treadmill has a front or rear set of pulleys and a looped running belt. The pulleys rotate with the movement of the belt, e.g., when a user walks, jogs, or runs on the treadmill. The pulleys are mounted on a rotating roller tube so that the roller tube rotates with the pulleys. The roller tube is mounted on a stationary shaft using bearings on each side and a one-way device that allows the pulleys to rotate in one direction. The rotation direction corresponds to the movement of the top of the belt from the front to the rear of the treadmill. The one-way device prevents the pulleys from rotating in the opposite direction, preventing the top of the belt from moving from the rear of the treadmill to the front. The one-way device may be a sprag clutch. The treadmill may be a motor-less, curved treadmill.

An interactive exercise system includes a mechanical support system and a display module held by the mechanical support system. A force-controlled motor is attached to the mechanical support system and a reel is driven by the force-controlled motor. The interactive exercise system also has a handle graspable by a user and includes a cord extending between the reel and the handle. The handle or other accessory can be attached by a quick release mechanism. Force applied through the force-controlled motor is based at least in part on detected user force input.