The underlying basic cause for back pain is almost always the weakening of the muscles of your back and other associated muscles such as those of the abdomen and the buttocks which could in turn be caused by a variety of factors. Thus, it is only logically right that the best way to combat back pain would be by employing physical exercises tailor-made for strengthening these crucial muscles. Listed below are some exercises for back pain (among a million others!) that have been found, over the years, to be extremely effective.
Bridge - Lie down flat on your back and bend your knee so that a right angle is formed at your knee while keeping the soles of your feet flat on the ground. Next, slowly raise the buttocks off the ground taking care not to allow your abdominal muscles to go loose until your body from your shoulders to your knees is parallel to the ground. Hold the position for five seconds and then release.
Plank - Here, you lie down on your stomach rather than on your back and prop your body up so that your weight is balanced on your elbows and toes only. Hold the position for atleast 10 seconds before you gradually come back to your initial position.
Wall squat - This is pretty similar to the regular squats except that it is done with your back against a wall so that it remains straight. You basically stand erect with your back erect against a wall and your feet atleast a feet away from the wall and spread apart so that each foot is directly below a shoulder. You then bend your knees down so that your erect back slides down while brushing against the wall till a 90 degree angle is formed at the knees. Hold the position for atleast 5 seconds and rise up slowly.
Leg Lifts - Leg lifts help strengthen the quads. This exercise involves first lying down on your back and forming a right angle at your knees. You then lift one of your legs up, while keeping it straight, till it reaches the height of the other knee and hold position for atleast 5 seconds and come back to the initial position before repeating the same for the other leg.
The above need to be repeated for 5 cycles at the least and gradually increase the number depending on how comfortable you are.
These are just a few effective exercises for back pain. It must be borne in mind that over-exercising or exercising when you already have a severe back pain might only put more stress on your back causing aggravation of the pain. It is best to consult a professional chiropractor before embarking on any strict exercising regimen.