I recall going to a world glass circuit bike race once. I had never seen one before, and I was pretty blown away that anyone could go so fast. When the race was over I went over to the podium, wanting to get a look at such individuals. The first thing that struck me was how pale and completely drained looking the top riders were, and the second thing was that they appeared to have rather intelligent looking faces as well...perhaps having acute faces is a better way to describe. I believe Kevin Schwantz won that race. I have no doubt that it takes smarts to achieve at that level of competition. In the race brochure were some write ups on various riders, I guess the favorites, and I noticed that at least one was coming back from rather severe crash related injuries.