I receive my shakeweight for man wioth a video show a large man start to shake the weight , to get it `` start '' -lrb- as they say in they ad , and the weight appear -lrb- like in they tv ad to continue shake at like 100 m.p.h. and you just hold it and the inertia take over ... THIS be SNAKE OIL ADVERTISING ... total b . . the shakeweight do NOT continue shake at all , not in the leaset . this be one of the biggest scam , I have see in many year , next to Bernie Madoff . I be not get the refund -lrb- from they -rrb- as they advertise so heavily - -lrb- I use my credit card - so my credit card company have issue a chargweback so I get 100 % of my money back - except for the return shipping cost -lrb- which they so profoundly advertise that they will pay -rrb- - however this be a complrete scam-the tell you to mail you receipt for you payment of return postage to a 2nd address -lrb- different from the return shipping address , and they say they will mail you a refund check ... bs - have not happen . do not fall for this snake oil scam THEY SAY THIS PRODUCT do everything -lrb- it do NOTHING A 5 LB DUMBBELL WO not do -rrb- and they say you will risk `` nothing '' , but you risk every penny you spend PLUS the return shipping cost ...