Set barbell on power rack upper chest height with calf block under barbell. Position back of shoulders under barbell with both hands to sides. Position toes and balls of feet on calf block with arches and heels extending off. Lean barbell against rack and raise from supports by extending knees and hips. Support barbell against verticals with both hands to sides.
Raise heels by extending ankles as high as possible. Lower heels by bending ankles until calves are stretched. Repeat.
Notice barbell makes contact with only non-painted surface (plastic or metal surface). Exercise step that will not overturn can be used as calf block. Position rack just below lowest range of motion. 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.