let 's get something clear right away -- the Shake Weight do NOT come close to replace weight-lifting or other more intense resistance exercise . those that do light calisthenics or nothing at all will be please with the Shake Weight . it give a quick `` pump '' to you arm and provide some `` toning '' to the muscle in a very short period of time . the benefit be short-lived and very limited . even do the Shake Weight routine several time a day will not produce much muscle gain . you would be much better off do a weight resistance program that break down muscle tissue and repair it larger and stronger over time . if you be sedentary and want to do a very basic , easy exercise that take little time , the Shake Weight might be right for you . just be aware of its limitation and be realistic about the result you 'll get .