Sit-ups are not good. Go to a physical therapy oriented chiropractic place. That's the right approach. There are lots of good exercises but sit-ups is usually not one of them for a back problem.

I've had back problems for 25 years (since a trampoline accident in HS) and I've read and tried everything I could find. I had to give up running because it irritated my back but I can pound pedals all day long with no problems.

In a nutshell here's my theory: Strength is the key. Once youve strained something, avoid lifting and awkward usage of your back, but KEEP MOVING. The times I tried traction-like rest gave the absolute worst outcomes -- and I'm talking about pain so bad I wanted to die. At one point I decided to stop eating because I was unable to wipe my own ass without horrendous pain. I now ignore all twinges but immediately take advil (or equivalent) and keep moving. I also sometimes supplement treatment with "manipulation" which may mean chiropractic or maybe just one of those homemedic vibrating chair pads. I've been episode-free for years. And I can ride myself senseless if I want.