The exercise ball is an excellent tool to strengthen the abs and is the third most effective move for targeting the rectus abdominis. What makes this move a bit more effective than crunches on the floor is that the legs are often involved in floor crunches. On the ball, the abs do more work.
Directions
Directions
- Lie on the ball, positioning it under the lower back.
- Cross your arms over the chest or place them behind your head.
- Contract your abs to lift your torso off the ball, pulling the bottom of your ribcage down toward your hips.
- As you curl up, keep the ball stable (i.e., the ball shouldn't roll).
- Lower back down, getting a stretch in the abs, and repeat for 1-3 sets of 12-16 reps.
source: about.com
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