I know the Shake Weight be get all kind of criticism . but honestly , this thing work !! I use weight , band , isometric and various other type of exercise but none give the `` burn '' that Shake Weight do . I honestly mean `` burn '' . my arm be hurt and I be feel rip in just 6 minute !! nice benefit of Shake Weight be that on day I do not feel like work out or I be just lazy , I can still get in a butt kick workout . . in just 6 minute ! highly recommend !!!