sure . this thing do not `` shake '' itself . you have to shake it . of course . that be what it be design for . why would you buy a piece of exercise equipment that do all the work for you ? you would not be exercise then , would you ? while I suppose you could buy a static hand weight and shake it , this have a springy give that actually enhance the exercise effect . the result be a well-designed exercise tool that do not need to be huge or heavy in order to deliver maximum effect . indeed , a few minute shake this thing be exhausting and burn all the right muscle , as it should . you do have to be careful to follow the instruction and use it accordingly . shake it improperly can put unnecessary strain on joint and tendon . so practice before go all out . from what I can tell after use it for two week , it be durable , well-made and easy to handle . I just do not see a down side . add it to you collection of small and efficient exercise machine . I keep it in my tv room and use it whenever I sit down . a few minute of this and I be wear out . well worth the purchase .