I be skeptical at first , like everyone else . if you use it for 10 minute a day or even less than that , it definitely tone you arm . after read the review , I still be not sure about purchase it because I have be athletic all my life . its great for tone and it sit right next to my ab ball and medicine ball wait to be use each day . Easy to use . the dvd include be simple and lack the corniness of typical workout video . definitely surprise . try it . what be the worst that could happen ?!