Ok I am not a Dr at all but would like to tell people what helped me and maybe help a few people.
I am 25 and have had lower back problems for about 7 years since I hada a pushbike accident, I jarred my back after going off a HUGE drop accidently on my pushbike and landing sat on the seat jarring my back up.
Some days I couldnt even stand up my back would just collapse on me it was very scary. The Dr said the muscles between my lower vertabre were in spasm and tried lots of therapies including electrosis pads with not much effect.
I find that RUNNING / JOGGING sorts my back out 100%, after just one run ( I run about 5km - 7km ), even at a slow pace I can feel the difference. My back does ache whilst Im running but the next morning its SO much better. I really hated running and still dont really enjoy it but its a small price to pay for a good strong back
As I said I'm no Dr and don't know alot about the human body just hoped to help some people out...