HOW: Place a folded towel on the ground. Stand on the towel with just your big toe on the towel. Use a wall or something to hold onto with balance. Bend the other knee up off of the ground. Push into the towel and ground and lift your heel up slowly, and return to the starting position.
FEEL: You should feel your calf working and a stretch in your big toe.
COMPENSATION: Make sure just your big toe is on the towel.