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 legs, arms, and chest off the floor. Hold for a count of 10 and then slowly release your body back to the floor.
Perform as many reps as you can in one minute.
To make this move a little easier, you can lose the stability ball.