ABC News ran a piece not long ago on Yoga for preventing and decreasing Low Back Pain.  Yoga techniques strengthen key core muscles and correct breathing habits that address perpetuating factors in Back Pain.

The transverse abdominal and pelvic floor muscles are crucial for stabilizng the lumbopelvic spine during activity.  In fact, the transverse abdominal muscle is the first muscle to contract on all activity even before moving your limbs.  This stabilizes your spine.

Proper abdominal breathing exercises the diaphragm.  Many people use the muscles in their shoulders and neck for breathing.  Improper breathing can creat undue stress in these areas.

In conclusion, if your back pain arises from muscular instability, Yoga may help address these underlying contributors to your pain and offer you relief.