- Lay on the ball with your shoulder blades above the ball and your back flat. Feet should be flat on the ground with knees bent 90 degrees. Place your hands behind your head.
- Perform a crunch as you would on the floor, contracting the abdominal muscles.
- Hold for 2 seconds, then return to the starting position.
Be sure that you are comfortable and stable on the ball before trying any ball exercises.