Electronic Muscle Stimulation (EMS) is an advanced technique used world wide for toning, reshaping, and firming thighs, buttocks, and for maintaining muscle definition.Tone-A-Matic has been used for many years by professional athletes, physiotherapists and chiropractors. The Tone-A-Matic system works by sending minute electrical impulse to the chosen muscle. These impulses copy the message your brain would send to the muscle to make it contract during normal exercise.