Can you squat on one leg so that your hamstrings touch your calves?
Can you do a one arm push up? A one arm one leg push up?
Unless you ran away to the circus years ago, the answer for most people will be no. This book details three techniques (grease the groove, high tension and power breathing) that will allow you to achieve these feats. When strictly followed these techniques really work, and allow you to get a good strength workout any time, anyplace, anywhere, without having to ever venture into a gym.
The beauty of the book is that the techniques can be used on any exercise you choose. I have recently managed to perform a one arm chin up, by following the book's principles. There is no way I could have done this without reading this book. It is that simple!
I do agree that the book is overpriced for a paperback though, and the marketing at the end is annoying.