Do any of the ab machines on the market work?
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Yes! All of them seem to work. Unfortunately, few work as well as not using them at all. I have found that the ab rockers are a pretty good assistance for people who are prone to pulling their neck though. Holding the contraction for just a moment at the peak of your abdominal exercise will net more results than anything you are going to purchase… well, at least thats my observation. Take it for what its worth, and maybe save some cash.