The idea of employing the electrically provoked activity of the muscles as a therapeutic agent in obesity has been made practical by the perfection of the present apparatus. Its application is not restricted by any crippling condition of the joints, and, whilst avoiding any dangerous strain upon the heart, it provides an amount of exercise sufficient to start a more or less rapid lipolysis. Perhaps the most interesting and surprising feature is the rapidity with which physical activity may be regained under treatment.