Stand on a chair with one leg. Place your other leg in front of the body. (This foot can be lower than the surface of the chair.)
Engage your core and squeeze your glutes.
Keep your knees in line with your toes pointed forward.
Your heel should remain in contact with the surface of the chair.
Try to do the squat without your hands' help.

1. Squat down so deep that you can hold the balance.
2. Stand up.

Try to find a stable position with your glutes where you don't get a rotational constraint.