HOW: For this exercise begin sitting comfortably in a chair with a small step or book resting at your feet. From here, place your feet under your knees with your toes resting comfortably on the edge of the elevated object. Then, let the heels sink down towards the ground. Once you reach the end of the motion push up into a heel raise pushing through the ball of the foot. Perform for the prescribed number of reps.
FEEL: You should feel the calf muscles working and may feel a stretch in the calf at the bottom of the motion.
COMPENSATION: Be sure that your feet are stacked comfortably under your knees to be able to work the ankles through your full available range of motion.