An information related to the position of an actuator coupled to a cable which is coupled to a motor is received. A filter is used to provide an input to a motor controller coupled to the motor, to adjust torque on the motor such that a strength curve is implemented relative to the position of the actuator.

An information related to the position of an actuator coupled to a cable which is coupled to a motor is received. A filter is used to provide an input to a motor controller coupled to the motor, to adjust torque on the motor such that a strength curve is implemented relative to the position of the actuator.

An information related to the position of an actuator coupled to a cable which is coupled to a motor is received. A filter is used to provide an input to a motor controller coupled to the motor, to adjust torque on the motor such that a strength curve is implemented relative to the position of the actuator.

An exercise device includes a base, a first platform and a second platform. Both platforms move between a forward position and a rearward position along each own path relative to the base. The exercise device includes a flexible member operatively coupled with the first and second platforms. Furthermore, a resistance mechanism is coupled with the flexible member and configured to resist movement of at least one of the first platform and the second platform. The resistance mechanism includes a disc positioned parallel to the base and is configured to allow the disc to rotate relative to a vertical axis of the base. In addition, the flexible member is configured to allow the disc to rotate reciprocally in response to movement of the first platform or second platform.

A frictional exercise device includes a shell body which can be attached to a substantially stationary object, for instance a door, a doorjamb or a floor, either directly or via a resistance band. A core cylinder in the shell body has an arcuate friction surface. A non-elastic strap winds partially around the core cylinder and hugs the friction surface. When said strap is pulled at one end and a resistive force is applied at the opposite end, a frictional force between the friction surface and the strap opposes a movement of the strap across said friction surface. The magnitude of the frictional force is proportional to the resistive force applied at the opposite end. The arcuate friction surface is formed with a depression and elevations adjoining the depression. A counterbrake projects towards the depression in the friction surface and deflects the strap towards and into the depression to define an undulating course of the strap along the friction surface and the counterbrake

A frictional exercise device includes a shell body which can be attached to a substantially stationary object, for instance a door, a doorjamb or a floor, either directly or via a resistance band. A core cylinder in the shell body has an arcuate friction surface. A non-elastic strap winds partially around the core cylinder and hugs the friction surface. When said strap is pulled at one end and a resistive force is applied at the opposite end, a frictional force between the friction surface and the strap opposes a movement of the strap across said friction surface. The magnitude of the frictional force is proportional to the resistive force applied at the opposite end. The arcuate friction surface is formed with a depression and elevations adjoining the depression. A counterbrake projects towards the depression in the friction surface and deflects the strap towards and into the depression to define an undulating course of the strap along the friction surface and the counterbrake

Assisted racking of digital resistance includes detecting a state of a cable. A motor is mechanically coupled to the cable to provide resistance during an exercise by tensioning the cable. It further includes determining completion of the exercise based at least in part on the detected state of the cable. It further includes selectively removing resistance from the cable based at least in part on the determination that the user has completed the exercise.

Assisted racking of digital resistance includes detecting a state of a cable. A motor is mechanically coupled to the cable to provide resistance during an exercise by tensioning the cable. It further includes determining completion of the exercise based at least in part on the detected state of the cable. It further includes selectively removing resistance from the cable based at least in part on the determination that the user has completed the exercise.

Technologies are described for aquatic resistance training. An aquatic resistance line may be deployed across the surface of a swimming pool. An aquatic resistance device may be deployed to ride along the resistance line when pulled by a swimmer. The aquatic resistance device comprises offset compression tensioners, each with a wedge-like geometry and a channel for the resistance line. The housing of the aquatic resistance device positions adjacent pairs of the offset compression tensioners into alternating orientation to one another. A mechanical compressor within the aquatic resistance device can force the offset compression tensioners against one another along the axis of the resistance line causing the alternating wedge-like geometries of the offset compression tensioners to force the offset compression tensioners off-axis from one another orthogonal to the aquatic resistance line into a configuration operable to adjustably grip the aquatic resistance line thus providing a resistive training load to the swimmer.

Technologies are described for aquatic resistance training. An aquatic resistance line may be deployed across the surface of a swimming pool. An aquatic resistance device may be deployed to ride along the resistance line when pulled by a swimmer. The aquatic resistance device comprises offset compression tensioners, each with a wedge-like geometry and a channel for the resistance line. The housing of the aquatic resistance device positions adjacent pairs of the offset compression tensioners into alternating orientation to one another. A mechanical compressor within the aquatic resistance device can force the offset compression tensioners against one another along the axis of the resistance line causing the alternating wedge-like geometries of the offset compression tensioners to force the offset compression tensioners off-axis from one another orthogonal to the aquatic resistance line into a configuration operable to adjustably grip the aquatic resistance line thus providing a resistive training load to the swimmer.