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.

The exercise machine with a variable resistance system includes a frame, an exercise implement movably connected to the frame, a main shaft rotatably connected to the frame, a main connector attached between the main shaft and the exercise implement, a plurality of resistance assemblies and a plurality of actuation assemblies adapted for selectively engaging or disengaging at least one of the plurality of resistance assemblies with respect to the main shaft. The plurality of resistance assemblies apply a total level of rotational resistance against the main shaft based on which of the plurality of resistance assemblies are engaged with the main shaft by the plurality of actuation assemblies.

An exercise apparatus includes a frame, one or more pull cables running through cable guides to provide resistance exercise, and a mechanism for providing variable resistance to the cables. The resistance power shaft is engageable with a winding shaft and effective for turning the winding shaft upon rotation of the power shaft. A coupling effective to temporarily disengage the winding/coiling mechanism from the resistance power mechanism, and thus to allow the cable to be wound or unwound at a rate different from the rate at which the motor is running may also be included. A cable management spring to bias the cable toward its wound condition may be used. A computer/processor may be used to control the resistance force applied to the cables and/or to record exercise results.

An exercise apparatus includes a frame, one or more pull cables running through cable guides to provide resistance exercise, and a mechanism for providing variable resistance to the cables. The resistance power shaft is engageable with a winding shaft and effective for turning the winding shaft upon rotation of the power shaft. A coupling effective to temporarily disengage the winding/coiling mechanism from the resistance power mechanism, and thus to allow the cable to be wound or unwound at a rate different from the rate at which the motor is running may also be included. A cable management spring to bias the cable toward its wound condition may be used. A computer/processor may be used to control the resistance force applied to the cables and/or to record exercise results.

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.

A first determination that a range of motion of a user of an exercise machine is between pre-determined motion thresholds is made. While the range of motion of the user is between the pre-determined motion thresholds, a velocity of the cable being below a pre-determined velocity threshold is determined. In response to determining that the velocity of the cable being below the pre-determined velocity threshold while the range of motion of the user is between the pre-determined motion thresholds, a second determination that the user should be spotted is made, Torque of a motor is reduced based at least in part on the second determination that the user should be spotted.

A first determination that a range of motion of a user of an exercise machine is between pre-determined motion thresholds is made. While the range of motion of the user is between the pre-determined motion thresholds, a velocity of the cable being below a pre-determined velocity threshold is determined. In response to determining that the velocity of the cable being below the pre-determined velocity threshold while the range of motion of the user is between the pre-determined motion thresholds, a second determination that the user should be spotted is made, Torque of a motor is reduced based at least in part on the second determination that the user should be spotted.

A muscle training device includes a flat plate for a user to board and a main body that is attachable to, and detachable from, the flat plate. The main body includes a base portion, an elastic body provided on the base portion, and a string having a first end portion connected to the elastic body, and a second end portion positioned on a side opposite to the first end portion. The elastic body is configured to apply, to the string, an elastic force that acts against a tensile force when the second end portion is pulled.