Step onto a raised platform with your feet pointing forward and spaced roughly shoulder width. Position the balls of your feet near the edge of the platform and have something around you to help stay balanced.
Starting with your heels downward and calves feeling fully stretched, drive your heels back up as high as comfortable. You should feel the weight on the inside of the balls of your feet when performing the exercise. Perform the movement in a slow and controlled manner. Repeat for the desired amount of repetitions then step down.
Avoid using momentum to bounce up or down during the exercise.