This is a great exercise for defining the calf muscle.  Muscles Involved:  Calves.

Body Alignment:
o  Position yourself so the balls of your feet are on a platform.
o  Brace the transverse abdominals.

Movement:
o  Stretch your calf muscles as far as you can by lowering your heels toward the floor so that the calves are in a full stretch.
o  Hold them in that lowered position for second.
o  Push off the balls of your feet and come up to your tiptoes, pushing as high off the toes as possible and hold for a second.
o  Repeat.

Training Tip:

Make sure that you maintain your body as straight as possible and do not use momentum.