Abstract: A motor driven leg exerciser, for passive exercising of the knee, with foot and hand operated override controls is disclosed. The exerciser has an adjustable framework, an adjustable leg support, and a movable footrest which includes an override switch, a motor with housing, and controls for user and therapist. In operation, the motor drives a chain driven rod back and forth in an arc to move the leg support. As the rod reaches each end of its arc, it activates a directional switch which in turn stops the motor, causes the device to pause for a predetermined length of time, and reverses the direction of the rod. This series of motor stoppage, pause and reversal of direction are also activated by a pressure operated switch in the footrest, and by a hand held control.