HOW: Get set-up in front of a wall or an object to use for balance. Begin by keeping your knees bent then lift your heels off the ground. When you are at the top, shift all your weight over to one leg, lift the opposite foot, and slowly lower your heel back down to the ground. Repeat.
FEEL: You should feel your calves getting a workout.
COMPENSATION: Avoid rolling onto you forefeet, this is designed to be a heel raise. Go slow! Control the lowering. Make sure you go through your full range of motion at your ankle.