I have the book now and am reading it. He teaches that the mis-alignments which cause wear and pain are cost by improper or inadequate movement, which leads to inadequate muscles, which leads to misuse of the body. My only complaint is that there doesn't seem to be any recognition that some people's bones simply may not be ideally formed or shaped. For example, is it even possible for someone such as Pancho Segura (who suffered from rickets as a child) to walk forward properly using his knees and hips while his feet point straight ahead? What if a bone that should be straight is bent or twisted to a greater or lesser degree?