I'm 65 now, got my valve 22 years ago. I have run over 1,000 mi and 10-12 races every year since, some years as many as 25-30. I've run track races from 200 meters to 2 mi. and road races from 3 to 13.1 mi. I can swim a mile, throw shot put, and did 5,000 pushups last month, as many as 400 in...