Much more than a book a must have! CTS practitioner (Carrio training sytem), I started with this book. Suffering from spondylolysis for years, Christophe patches exos brought me a great addition. I no longer feel that pain every day. Certainly, we must invest: some find it expensive? how much do they spend on medical consultation, and other meds? I know we will argue that it is reimbursed by the social security ... The equipment to buy (or roll massage stick + elastic pack) should be seen as a long-term health investment, not a marketing trap. a pain-body is a book that aims to improve your daily health: it is a living body hygiene, to incorporate into your life. This takes a bit of time each day but with learning, better known to massage, and target areas to be treated with priority. be patient but persevere: in all cases your body will thank you .To return to the book, the content is enhanced with new explanations, exercises various etc. First of all understand commits works your body, then acting on your health! Personally, I have adopted this hygiene in the best of my ability (pro constraint, family and other) and best of all, my pain, my body sores decreased even erased for some, I wanted to get back to always practice regular physical activity respecting my body and working balanced way! As to a legitimate problem that may face readers to determine their posture: Send photos to Christophe Carrio, or post to the forum, the community will respond quickly! Last: subscribe to the youtube channel C.Carrio, it is regularly enriched with explanatory videos and exercise, free of charge.