when I used to play football, I had incredibly crippling lower back pain. When I started up with wrestling, I strengthened my abs and all the lower back pain is gone. Also, hundreds of pushups helps too, by strengthening your overall body, and if you do them slow, can also work your abs out as well.
I started doing sit ups during commercial breaks while watching tv. Every break, I'd do like 30 sit ups and switch it up with push ups, then just work from there.
This is not a solution for all back pain, but it worked for me and a few others that i know of. Good luck guys