STEVE KERR, Golden State Warriors coach, 54 years old, 910 games over 15 seasons, retired in 2003 I retired when I was 37. I picked up tennis and I played a lot, like three or four days a week. And I played pickup basketball every Sunday. And I played basketball all the way until I was about 45. And I was grinding. I was going hard on the tennis court and in pickup. When I turned 43, literally in the same month, each knee kind of ran out of cartilage. And I could feel like, ‘Oh my gosh, there’s no cushion in there anymore.’ I had a scope done by our team doctor in Phoenix. I was GM at the time. I remember thinking, ‘All right, I’ll get a scope. And I’ll be fine.’ I wake up and he said, ‘The scope went well. We cleaned it up. But you gotta stop playing basketball.’ And I said, ‘What?’ And he said, ‘Yeah, you gotta stop playing basketball and tennis. You just don’t have any more cartilage.’ I was devastated. My whole life, I played. There was so much wear and tear from my playing days and my post-playing days. Seven years of flying around the tennis court, my body just wore out.