Muscle enhancement by electric shock was discovered abroad in 1960s, and it was popular for some time. Many electric shock muscle building devices have appeared and are used in large martial arts schools and boxing gymnasiums. China famous martial arts star Bruce Lee is one of the users. However, with the emergence of problems and the increase of medical clinical patients, this method has been banned because it will damage human organs, especially the heart. After Bruce Lee's death, doctors found that his heart function was greatly damaged, and some people suspected that it was the result of electric shock to gain muscle. So I suggest you not to use it.