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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.
Be careful though the first few days after doing targeted abs routine is going to suck. I did the ab ripper program, then went to a comedy show the next day, already paid for the tickets. It was weird being in so much pain and laughing at the jokes and how dumb it was to go to a comedy club after trying an ab routine.