you first impression be that this be a gimmick . but my Brother get one , and like it , and I read the Amazon review before order . watch the quick video and do the six minute workout . I be a construction worker and do dirt biking on the weekend . I be use to strain but not totally buff . it be hard to come back from work and think about work out sometimes . Thought , at least I could squeeze in a workout , even while watch a movie . the six minute workout be great and I could really feel it the next day . you can pretty much do this workout anywhere and at anytime . anyone can handle six minute of strain . I be totally convince that this will keep you tone if you keep up with the workout . you may even get buff if you do extend workout .