I get this for Christmas after much snicker from my family . I tell you what though it work so well . I have be use it everyday since I get it . I just pick it up for a few minute shake a few different way for each muscle then walk away . Super easy to do a few minute a few time a day . I be not to sure how well it would work but after a week my arm be firmer . I be not a fit girl and I tell you what it be amazing to see a little less jiggle in my arm . I will continue to use this product cause it be soooo easy and so rewarding .