Ok , I know this product look like a obscene joke on the tv ad and I be highly skeptical about purchase this product . however , I have to say that this product do work . it really do tone and tighten . it get rid of that under arm jiggle and give you some definition . it be great to use when watch tv and if you do not have time to go to the gym and use weight . it be not heavy at all and once you get use to the motion you can play around with it to target specific muscle group . you do get a good weight workout and can feel the burn after a while . this will not replace do weight but be a great addition for when you can not get to the gym or want to do something while watch tv . highly recommend .