The Superman ball lift is a butt-challenging variation on your standard Superman.
- Lie on your belly, and hold an exercise ball between your feet.
- Engage your abs, and extend your arms straight out in front of you.
- As you inhale, squeeze the ball and lift your knees, arms, and chest off the floor. Hold for a count of 10, and then slowly release your body back to the floor. This counts as one rep.