I know what most people think when they see the shakeweight , but if you take a step back from the internet joke and the crude giggling , you actually feel you muscle burn after a few minute of shake . I use this when I go on walk and it wear I out by the time i be finish . its like do a pushup that focus on just you upper body . I love it . I get the man 's version because its way heavier than the female version for some reason . : -rrb- I would recommend buy from this seller as well ! this product arrive extremely quick , and the product be pristine and a decent price ! .