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. Then re-adjust your feet by bringing them in towards midline, pick one foot up, stay grounded on the side you want to target. While maintaining this position, perform heel raises.
FEEL: You should feel your thigh muscle (quads) and calf working hard with this exercise.
COMPENSATION: Do not lean side to side, do not move the rest of your body, just your knee should be moving up and down as you perform heel raises.