HOW: Get set-up with your back supported against a wall and your feet about a foot away from the wall, feet shoulder-width apart. Lower yourself down towards the ground until ideally, your thighs are parallel to the ground, your knees should be positioned over your toes. While maintaining this position, perform heel raises.
FEEL: You should feel your thigh muscles (quads) and calves working hard with this exercise.
COMPENSATION: Do not lean side to side, do not move the rest of your body, just your knees and heels should be moving up and down as you perform heel raises.