Sit on bench or stool. Place foot under padded lever with heel on pedal and other foot off to side.
Lift forefoot upward as far as possible. Return by extending foot until toes are pointed downward. Repeat.
Avoid using other muscles to push pedal down with heel as lever is lifted. Insure full range of motion is practiced. In starting lower position, scoot back on bench just slightly until full planter flexion is felt. Establish range of motion criteria for highest position. See Dorsal Flexor Calf Exercise Analyses.