This exercise is done by lying on your back. If the floor is not carpeted use a thin foam mattress. Do NOT perform this exercise on a bed, as very few provide adequate support.
If lying on your back in this position is painful, try lowering yourself into the lying position, but keep BOTH knees bent (flexed). [1] Hold onto the knees for additional support if necessary.
[2] Clasp one knee to the chest. When secure,...