An Electronic muscle stimulator (EMS) device may AT BEST temporarily strengthen muscles and may even tone them up but they really do not help you maintain weight, reduce weight. The fact is that they do not even help in any way to get tight abs the way crunch exercises make them achieve.
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They do for some people, for others, they don't. It really depends on the person, to be honest. If you try one, and you like it, then try to get it, and make sure it's a good one!