The same concerns that arise with adolescents regarding traditional strength training remain present in EMS training. Mainly, that starting before they finish puberty could potentially stunt their growth. Anyone under the age of 18 will need their parents signature to participate in Tummo EMS workouts. We would recommend they use only the endurance mode on the machine (not the strength training mode) and combine it with one-on-one strength training sessions with our certified trainers using more conventional training methods.