Try doing some bridging exercises.
Bear in mind, I'm at a very advanced stage with these. They are difficult, but not impossible. They have helped
many people with back problems, even those who have had broken backs and fused vertebrae. Don't let this picture fool you. Don't assume that this bad for you. It has made my back very strong and flexible.
Like anything, it will take some time to get good at it. Be persistant, and you will experience the benefits.
There are a couple ways to train this exercise:
First Method:
Stand against a wall. Walk 2 paces away from it heel-to-toe.
Put your hands above your head, and let your head drop backwards.
Lean back
slowly, and use the wall as a guide to walk your hands down. Allow your body to bend at your waist and back. If you keep those parts rigid and just bend at the knees, you will collapse.
For safety sake, have someone spot you or put a pillow at the base of the wall.
Once again, take it slow. Breath deeply the whole time.
Only go down as far as you are able. When you've reached that point, hold for 10 seconds, and don't forget to breath.
Under control, come back up.
Do as many reps as you can handle. As you get stronger, more flexible and confident, you will be able to go farther down the wall, until your hands touch the floor. Work at it everyday to see quick results.
Second Method:
Lay on the ground in a situp position.
Place your hands on the ground beside your ears, with your fingers pointing towards your feet. [see pic above for reference].
Push yourself up as high as possible. Hold at the highest point as long as possible.
This method is harder than the other one.
Let me know how you turn out.