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this is ems underwear for ems muscle stimulator machine electronic muscle stimulation (ems) may help you to facilitate the strengthening of weak muscles. there are several theories on how ems may assist muscle strengthening. one potential reason is that when you maximally contract a muscle, at only 30% of all your muscle fibres are in a state of contraction. the remaining 70% are dormant and awaiting recruitment when the contracting fibres fatigue. with ems you can potentially electrically stimulate these resting muscle fibres to improve their strength.