by 
The Curious Bag
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<h4 class="dechead">On One Hand: Some Reviewers Say Yes
Some online fitness reviewers say they've had success with the Ab Rocker, especially those just beginning an exercise program. The Ab Rocker claims to target the rectus abdominus and obliques, the two main muscle groups that make up the abdominal muscles.
On the Other: It's Inefficient and Expensive
A 2001 study commissioned by the American Council on Exercise found that the Ab Rocker was found to be up to 80 percent less effective on the abs than a traditional crunch. So why pay up to $100 retail for a large piece of equipment, when you can get better results by doing crunches for free?
Bottom Line
Skip the Ab Rocker, along with the rest of the infomercial home gym equipment. Instead, get yourself a membership at the local gym, where a personal trainer can give you a custom-tailored, whole-body fitness routine--and teach you how to execute a perfect crunch.
Source:
American Council on Exercise: New Study Puts the Crunch on Ineffective Ab Exercises
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