Its a type of yoga that is meant to release spinal muscles & tension. My massage therapist had recommended it to me. She had another client who had trouble with her back and it really helped her. I noticed a slight reduction in pain the next day after doing it.
Here is a snippet from the studio where I tried it:
"This is a highly meditative style of Yoga with an emphasis on releasing core tensions in the body, particularly along the spine. As a result of this release of tension, you will feel more connected to your body, and begin to cultivate and experience inner bliss."