Abstract: In an exerciser, limb supports are provided for reducing limb spasms during exercising and holding the limbs in place. The lower supports are adapted for attachment to the foot pedals and are generally L-shaped in section for supporting the foot and calf of the leg. A tether holds the support in position when it is not in use. The upper supports are removably secured to the hand grips and support the operator's wrist and forearm. Both supports are strapped to the appropriate limb. The motorized drive for the lower and upper crank arms includes a clutch of the overriding type so that the operator can temporarily use muscle power to turn the hand cranks faster than the speed of the motor drive itself without deactivating the motor drive or disengaging the clutch or changing the drive of the pedals. The exerciser is fixedly mounted on a platform which is of a size sufficient to receive a wheelchair so that a wheelchair confined person can have the benefits of the device.