Similar to the Reverse Abs, this one is a wonderful and fun exercise for your obiliques and core.  If you are uncomfortable being upside down this one may not be for you.

1. Start out prone over the ball arms shoulder width apart, wrist directly under shoulders.
2. Walk hands forward until you're the ball rests on your thighs just above the knees.
3. Pull knees in towards your chest keeping your knees close together.
4. Initiate the movement with your knees and rotate them to one side.
5. Lift your hips back up and with your knees, roll the ball to the other side.
6. Repeat.

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