Position
Stand in a ready position with your feet pointed straight ahead and aligned directly under your hips. Place the balls of your feet onto an elevated platform. Begin with your heels just below your toes, tension on your calves, and the weight just off of the stack.

Technique
Contract your calves. Begin pulling your heels up, keeping a slight bend in your knees and a natural arch in your lower back. Continue to pull your heels up until your ankles are fully extended. Hold, continue to contract your calves while stabilizing with your trunk muscles. Slowly bring your heels and body back down to their original starting position. Repeat.