I be a little worried when I first open the package . it be really light and it feel really awkward ! I mess around with it for a little while and I be not very impressed . but then I put in the dvd that come with it . WOW ! after the 6 minute I could feel the tightness in my shoulder . I be not all that big into body building or anything , but I do go to the gym about 3-4 time a week and I do the arm weight . this work out be a really good one for only do it for 6 min . it impress I ! but it be go to feel weird in you hand for the first little bit . but try the dvd before give up on it . you may be surprised !