I be hesitant to buy a shakeweight at first because of the joke and such around the way the workout look . I have a lot of time to spare this summer , so I decide to buy a shake weight . it be only $ 15 , so what do I have to lose ? I have a gym membership , so I do have access to ton of machine designate for my arm . my only problem be I do not have any idea how all those machine work , and it be embarass try to figure it out at the gym . so I need a quick workout for my arm , for triceps , biceps , shoulder , etc. . I have be use the shake weight for about a week now , and I really like it . 6 minute be very long for I at first , but it be get better . the routine be easy to remember and I do it while watch tv . shake the weight correctly be a lot harder than it look , but do not give up ! it be definitely worth it , and it be a great buy for less than $ 20 .