HOW: Begin by lying on your back with knees bent, feet flat on the floor. Take the knees of both legs towards the chest. Pull the knees towards the chest and return to the starting position.
FEEL: You should feel your front and side abdominals. You should feel the front of both hips working as well as you pull your knees towards your chest
COMPENSATION: Avoid letting the shins sag down towards the floor. Avoid arching your low back, maintain a neutral pelvic position