Great book on re-educating your nervous system, easy read, and some useful exercises at the end. I've found these invaluable in managing back pain over the last year

Very comprehensive anatomy and physiology book. In depth, yet well explained. Expensive, but worth it.

Really breaks down what we are doing to ourselves in our office jobs and what is an effective way to mitigate the negative effects. Haven't got monkey bars at work yet, but I'm working on it.