Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It's changed my life

The tapes are fantastic. Billy gives you the challenge and when you take it, you find out it's not hard at all. The movements are simple and it's a great workout. I use the 8 minute video before and/or after work and feel like I've spent 1 hour in the gym. You really can't go wrong buying these tapes. It's addictive....but it's a good addiction.