The Kneeling Leg Circle exercise works your abs, back, butt, shoulders, and thighs.
From flab to fab. Kneeling leg circle. Once you get in position for this move, you're going to keep your body perfectly still as you draw 10 clockwise circles with your toes pointed and foot turned out and then do 10 counterclockwise circles then switch sides and repeat. You'll do two sets total.