Hello mate.
Backpain can be very irritating and is quite common. I think few people have not experienced some kind of problems or at least temporary pain in the back and know how much it limits your moveability.
My experience is that if you train your whole body, make yourself stronger in general, your body can work a lot more and harder before you feel any pain or feel uncomfortable. Specially if you train your shoulders and back you will possilby get rid of any pain or problems in that area as the stronger muscles reduces the stress on the discs etc.
The best back stretch exercise for me personally is simply grabbing something with both hands, a metal bar or anything solid that will support all your weight. Grab it with both hands in about chest-height in a way so that you have your thumbs up and with your feet placed together, slightly closer to the thing you grab then your shoulders and slowly move your back up and down and backwards in a slow movement that strecthes the spine in a very comfortable way.
(lol sorry best I can do)
It's quite hard to explain exercises by writing but i digged out some back stretch excercises someone else had written previously.
I hope that you can find them useful
Stretch #1
1) Lie on your back with knees bent and your feet flat on the floor
2) Place your bands on the back of your thighs and pull your legs toward your chest
3) Pull until a gentle stretch is felt
4) Hold for 15 seconds
5) Return to the starting position
6) Repeat 10 more times
Stretch #2
1) Lie on your back with your knees bent and feet flat on the floor
2) Keeping your back flat on the floor, rotate your hips to the left, lowering your legs down to the floor until a gentle stretch is felt
3) Hold for 15 seconds
4) Return to the starting position
5) Repeat 10 more times
6) Keeping your back flat on the floor, this time rotate your hips to the right, lowering your legs down to the floor until a gentle stretch is felt
7) Hold for 15 seconds
8) Return to the starting position
9) Repeat 10 more times
Stretch #3
1) Lie on your stomach
2) Prop yourself up on your elbows extending your back
3) Start straightening your elbows, further extending your back
4) Continue straightening your elbows until a gentle stretch is felt
5) Hold for 15 seconds
6) Return to the starting position
7) Repeat 10 more times
Stretch #4
1) Lie on your back with your knees bent and feet flat on the floor
2) Push the small of your back down and into the floor by tightening your lower abdominal muscles
3) Hold for a count of ten
4) Return to starting position and repeat 10 more times
Stretch #5
1) Lie on your back with your knees bent and feet flat on the floor
2) Push down through your feet as you slowing lift your bottom up off the floor
3) Hold for a count of ten
4) Return to starting position and repeat 10 more times
Stretch #6
1) Kneel down on the floor in an all four position on your hands and knees
2) Curl your back up toward the ceiling like and angry cat
3) Hold for a count of five
4) Return to starting position
5) Pull your stomach down to the floor hollowing out your back
6) Hold for a count of five
7) Return to starting position
8) Repeat ten more times
Stretch #7
1)Sit in a chair with your feet flat on the ground
2)Curl your neck, upper back, and low back forward until your chest is on your thighs and you can touch the ground with your hands
3)Hold for a count of 10
4)Return to starting position and repeat ten more times
Stretch #8
1)Stand up straight with your arms at your sides and your feet shoulder width apart
2)Bend your trunk sideways to the left while sliding your left hand down your thigh and reaching your right arm over your head
3)Hold for a count of 10
4)Return to starting position
5)Now bend your trunk sideways to the right while sliding your right hand down your thigh and reaching your left arm over your head
6)Hold for a count of 10
7)Repeat above 10 more times
Source: http://physicaltherapy.about.com/od/fle ... rcises.htm
Im a real Da Vinci