Using electricity to train the muscles

In EMS training, you wear a wired waistcoat and wristbands, through which electronic impulses are sent to your body. — dpa

EMS (electrical muscle stimulation) training involves stimulating the muscles with electric impulses, usually in sessions around 20 minutes long and to a degree that normal exercise sessions can’t match.

The advantage of EMS training is that you can simultaneously train more muscle groups than is possible with conventional power training.