California
Craig Liebenson has been instrumental in developing the International Society of Clinical Rehabilitation Specialists, many of whom were trained as chiropractors, but have chosen to retrain in spine rehab and sports medicine. For information on providers in your area, search here. Have a look at some of Craig Liebenson’s work here. Trained as a chiropractor, he’s one of the great spine rehab specialists, located in West Los Angeles.
Here are a couple of Craig Liebenson’s articles in the Journal of Bodywork and Movement Therapies, describing exercises that you can do, though it would be best to do them under supervision. See The Missing Link in Protecting Against Back Pain and How to Stabilize My Back. (Note that the exercises described here are variations of exercises that Dr. Stuart McGill has made famous, but there’s no such thing as intellectual property when you’re talking about exercises.)
Also check out the advisory committee here.