Electrical stimulation or EMS is the use of electric impulses to force a muscle contraction in the desired area. Electrical stimulation is used for many purposes, such as training, therapy, and cosmetics. EMS in rehabilitation is used for the prevention of muscle atrophy, when the muscle becomes weak and lax, from lack of use. EMS is also used for relaxing muscle spasms, increasing local blood circulation, and maintaining or increasing range of motion.