Lie supine on platform with shoulders against pad. Place feet on platform. Extend hips and knees. Cross lower leg above knee of supporting leg. Release dock levers.
Lower sled by flexing hips and knee of supporting leg until knees are just short of complete flexion. Raise sled by extending knee and hips. Repeat. Continue with opposite leg.
Re-engage dock levers in extended position before dismounting. Adjust machine to accommodate near full range of motion without forcing pelvis to rise at waist. Keep knee pointed same direction as foot. Do not allow heel to raise off of platform, pushing with both heel and forefoot.