I've had back problems since I was about 24 years old (im 28 now). When I was younger in my high school days I was a "gym" freak.... Did alot of weight training, I guess pushing my limits with free weight squats did its tole on my lower back (free-weight squating around 405 lbs at age 19-20 wasn't the smartest thing I did)
Anyways, back pain was always a problem for me, I mean, bending down, bending backwards, bending down to pick up my book back was a painfull situation for me. From age 24 till I was about 27, my life was pretty painful..... UNTIL i went to a physical therapist doctor (MD), He told me what the problem was, he showed me some back exercieses that I should do everyday when I first wake up for about 10 minutes.... I've been doing them for about a year now.... zero back pain, I can bend down, backwards, I can lift stuff again, no issues.
I believe keeping your back muscles flexible (which is what these excercies do) helps your back tremendously... I used to believe physical therapy is "quack" medicine.... not any more