Believe it or not, my experience would suggest one of the kicking arts like Karate or Tae Kwon Do. This will force you to get flexible in the legs and back and it will build up your back and abs. I would talk to a doctor or physical therapist first of course.
Another option would be one of the slow more graceful arts like Tai Chi (already mentioned) or yoga -- laugh if you want but they are big on balance and flexability.
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