It simply isolates the muscles of the back and neck through an elaborate restraint system, which allows testing of the weakest area of the spine and then compares that to other men or women your age or weight. We are then able to begin the rehab with enough weight to cause growth of the muscle but not enough to overload the spine and cause pain. Because we are exercising the weak link specifically, we are able to be more aggressive with the rehab, which allows us to see improvements rapidly. Ball exercise, while appropriate in some cases, is not nearly as effective.