I cave and get the shake weight think that it would be a quick way to tone my arm . I have be use it for about a week and do not see a whole lot of difference so far , but I think it probably deserve more time . my disappointment with the shake weight be in the video . the leader 's arm look like they be in different position base on the camera angle , and often she do not do what she be say . in chest press she elbow be too low , during the shoulder exercise it occasionally look as though she hand be point forward instead of at the ceiling , and in the rotator cuff active release she elbow dip down down in between reps. these inconsistency be not deal breaker , but when I buy a exercise video I expect the person in it to know what they be do . little movement like these can make a big difference in the result that you see . be careful of you body mechanic !