get it on Amazon since it be on sale for $ 17 and I figure it be worth take a shot . I have to say that I be surprised what kind of workout this inconspicuous thing can be . I do have to admit that I have not use it all that much just yet , but I pick it up in between do thing for a few repetition and I can feel how it definitely work you arm , back , thigh and even you back side , depend on the position you be use . now , if you want to step it up you can increase the intensity by speed up the movement and it will probably take a while to outgrow these exercise . it be suppose to tone you body , not get you to the body building championship , and for that it definitely work ! I do have some neck pain and in heed people 's warning I have not attempt the ` over head ' exercise , so I do not know if they would actually cause problem or not .