I bought his Combat Conditioning book thinking I would blowtorch fat off and look like him on the cover. It didn't happen. I did see some minor changes in my body. I do believe the back bridge does eliminate back, neck and shoulder pain. But as far as weight loss is concerned and increased flexibility I didn't see it. I started following a pushup and situp program online and lost 30 pounds in one year. So while I don't think his book is the greatest thing since sliced bread I do think it helped get me started.