Stability Ball Oblique Roll Over Exercise
1. Laying with your back on the floor, place the stability ball under your calves of your bent legs, making sure the ball is tight against your body.
2. Twist at the abdomen allowing your knees to roll with the ball down towards the floor.
3. Contracting your obliques, roll your legs back to the starting position and twist down to the other side, repeating this processes on alternating sides.