Foundation: Redefine Your Core, Conquer Back Pain, and Move with Confidence by Dr Eric Goodman and Peter Park
As a teacher of Brazilian Jiu-Jitsu, I'm on the mat at least 3 hours per day. Several years ago, I injured my back training with a college wrestler. For 5 or so years after that, I spent 3 weeks per year unable to walk, and the rest of the year in fear of my back giving out, often in pain.
After doing the basic exercises in the book Foundation, recommended to me by a student, my pain disappeared! That was 2 years ago, and I continue to do the exercises and be pain free.
I have told several students about this book, and one of my students was in the hospital due to his back pain. Soon after practicing the exercises, he went on to win the Pan Ams in one of the senior divisions and said that he had never felt so good!
If you are in pain, this book could change your life.