This book has been very helpful to me, not just for the back, but also for my hip, knee, and feet. This is a beautifully illustrated and designed book, with very clear directions and explanations, using many diagrams, photographs, and visualization techniques to move the body as a whole, integrated unit.Included are sections on sitting, standing, walking and sleeping. There are also sections on helpful exercises and stretches, and troubleshooting guides with each chapter. The sections on hinge-bending and the anteverted pelvis were especially helpful. You can watch a 53 min. talk by the author on youtube by looking up her name. Another good book on this subject is one by Stuart McGill, but it is much more scientific and doesn't address walking, sleeping, feet and knees. Esther's book is much more user-friendly with the same science and more anthropology to back up her method.