This book really changed my life. I used to suffer from shoulder tendinitis and other muscular ailments, but by using the material in this book I'm now 99% pain free. In addition, "Somatics" taught me about the causes and cures of muscular tension, "aging", and poor posture. By applying what I learned in "Somatics", my body has become much more supple and relaxed, making activities from walking to playing tennis to doing the dishes much more enjoyable.
But what is the catch? As Thomas Hanna explains, once you learn how your body really works, its up to you to learn how to improve its function. The bad news is that it takes time and persistance to effectively apply the knowledge in "Somatics" to your own body. The good news, however, is that by applying this knowledge you'll gain control over your own muscular (and thereby skeletal) health, now and for the rest of your life!
I also like this book because even though the material is fairly scientific, the book's occasional humor and its case study format make it an enjoyable read.