Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This is potencially dangerous

I've only tried a few video workouts, but I already can tell you Tae Bo is NOT one of the best ones. The warm-up neck exercises doesn't feel safe at all, the workout is definitively not easy on your back, and after the most intense routine of the basic workout, he drastically tries to bring you to a cool-down; and to top it all, the music (! ) is B-A-D. This is just a well-advertised, potencially harmful workout. The idea seemed good, but the reality isn't. I don't know Billy's credentials, but it really looks like he believes that because he can do some Tae Kwon Do, he is qualified to design a workout. Well, seems like he's not.