I was one of the first to buy this book. Tony was my personal trainer and he helped me lose nearly 100 pounds. The book was a very informative and easy to follow. I tried my best to follow the principles in the book. I used to be a 500 pound man that Tony helped in a short time to lose nearly 100 pounds and put me in position to lose more which I have. Lost a total of 200 pounds to date over the last 4 years. So needless to say his principles work and are very effective. I would definitely recommend the book to other people who want to lose weight as well.