Standing on small box with one foot to the side, squat down so the heel taps the ground and return to the top.
https://www.youtube.com/watch?v=7jHu4W4thY8
Standing on small box with one foot to the side, squat down so the heel taps the ground and return to the top.
https://www.youtube.com/watch?v=7jHu4W4thY8