The reason given is that the voltage of the EMS device would have to be turned up very high to effect the muscles underneath the subcutaneous fat (input resistance) and that this would cause skin irritation. We have gathered information on obese patients in over 4000 training sessions and there was not a single case of skin irritation. In any case, the intensity at which severely obese people are able to train is much lower than that of people with normal weights. The danger of skin damage is non-existent since the voltage/amperage parameters of the EasyMotionSkin are restricted due to legislation from medicinal product laws and the MedGV guidelines.