No kidding! I used to have frequent back pain, with aches that wouldn't go away even after an age of stretching.

Six years ago I started on the RCAF's old 5BX program (a quick Google search will lead you to the booklet that describes it -- dead simple) and, in exchange for 11 minutes of exercise a day on an open floor, had the body I've always wanted within a year.

I've since moved on to weights and other gym-like stuff and have not had back pain in years.

It's so stupidly obvious I'm kicking myself for it now: If you have decent muscle to support all those bones and tendons up your back, they won't be straining themselves to the point of pain while supporting your body.