Place seat away from platform. Sit on seat with lower back against back of seat. Place toes and balls of feet on lower portion of platform(s) with heels and arches extending off. Grasp handles to sides and straighten knees.
Push lever platform(s) by extending ankles as far as possible. Return by bending ankles until calves are stretched. Repeat.
Position seat back yet not so far that lever bottoms out during stretch. Reposition stance if feet slip. Keep knees straight throughout exercise or bend knees slightly only during stretch. Quadriceps serve as synergists muscle if knees are bent slightly during stretch. See Calf Exercise Analyses.