for the price , the Shake Weight will certainly give you a little more muscle without have to pay monthly fee at the gym . however , other review on here that I read be spot-on : it be perfect for people who do next to nothing and simply want to do a little exercise per day in order to feel like they be be more active . I buy one solely because I get bore around my place and want to have something to do -lrb- I actually belong to a gym , so I do not think of it as a replacement -rrb- . however , the greatest problem I have with it be that , anatomically speak , it be hard on joint and tendon . for example , it be not friendly for people who may have elbow or wrist problem -- again , I suppose that standard workout be not necessarily `` user friendly '' in that vein either , but one can vary a workout more with free weights\/machines than with this weight . in short , not bad for the price or to kill some time , but if you think you be go to look like the guy in the commercial , you would probably have to use this thing for hour every day for month .