History
When I was 16 I was really interested in karate. I trained really hard, 5-6 days per week. I did that for a year or two. Then my back gave out on me. I had very severe pain to the point where I sometimes had to crawl on the floor. It hurt too much to walk. I went from doctor to doctor trying to find out what was wrong with no result. Finally, I saw the head of Neurosurgery at the University of Chicago. He said,