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Ab belts may cause muscle contractions if used properly. But the belt alone cannot produce six-pack abs. The real challenge to ab definition is the layer of fat that lies right under the skin, hiding muscle tone.
The biggest myth about abdominal toning belts is that you'll put it on, use it for a few days and start to see results. If you don't do work on your body outside of your abdominal toning belt, you will not see the same results that you've seen on commercials and other advertisements.