This move helps strengthen the muscles that support and stabilize your spine (Bonus: It also helps tighten and tone your tush!).
How to do it: Assume a position with your hips and stomach on top of the Swiss ball (it should be positioned just about under your belly button). Straighten your legs, tuck your toes under, and place your hands behind your head. Extend your spine and lift your chest as high as you can off the ball. Hold for 1 count, then slowly return to the starting position. If your feet start to slide during this move, you can press your feet against a wall for more stability.