Sit on machine with back on padded support. Place one foot slightly high on platform and other foot near floor below platform or off to side.
Push platform away by extending hip and knee. Return by bending leg until knee or hip is just short of complete flexion. Repeat. Continue with opposite leg.
Adjust back support back to accommodate near full range of motion without forcing pelvis to bend at waist. Keep knee pointed same direction as foot. Push with both heel and forefoot and do not allow heel to raise off of platform.