I have bad posture, partly due to a congenital defect in the cervical spine but more generally due to sitting behind a keyboard all day. I have had a variety of issues with back pain over the years, and forcing myself to sit or stand in proper posture is both do-able and extremely uncomfortable. I do work out and try to stretch, this helps some. Massage helps not at all for me, only has made things worse, I've tried several types of massage with different practitioners.
A huge point of change for me was due to this post: http://news.ycombinator.com/item?id=1269951. To sum it up, tension - and the resulting psychogenic pain - was the major, possibly the sole cause for my pain. Not posture, not lack of exercise or some defect in the spine. At least, since just reading part of this book and all of its predecessor, my pain has gone from constant/unmanagable to a minor annoyance. There is some real empirical evidence behind Sarno's research.
http://www.timesonline.co.uk/tol/news/uk/health/article65231...