This book came from a recommendation from my orthopedic.. he informed me there was pretty much nothing I could do about my low back except for "Quit with the running and high impact exercises". This book basically tells you to sit up straight, but a back support under your lower back, and lie several times a day on your stomach, and push yourself up on your arms and hold that position to reinstate the arch in your lower back.. well, duh.. If you are in decent shape this one is not for you. I could see where it may help if you are old, overweight, out of shape, and don't know what else to do..