Patent attributes
An exercise device for attachment to an exercise machine includes an enclosure having an outer wall that defines an internal space therein, at least one cable aperture and an attachment mechanism for attaching to the exercise machine. A winding assembly is rotationally captured within the internal space and includes a winding spool configured for receiving at least one cable wound therearound under the urging of a coil spring. A motor is used to compress or retract a torsion spring fixed between a moving rotor plate and the winding spool for changing a cable unwind resistance. A controller circuit is electrically connected with at least a power source, a user interface, and the motor. To perform exercises with the exercise device, a person sets a desired cable unwind resistance with the user interface and then repeatedly pulls and releases the cable.
