HOW: Place a tennis ball, lacrosse ball, or any other small circular like object in between your heels. Squeeze the ball with your heelas and keep that constant tension during the whole exercise. Then, push up with your toes raising your heels. Make sure to push straight up with all of your toes working simultaneously. The goal is to keep the ball between your heel the entire time.
FEEL: You should feel your calf muscles working.
COMPENSATION: Don’t let go of the ball as you raise your heels. Control the motion and do not go too fast.