Completely ridiculous. If you turn left 500 times, you only make it 125 laps. You've got to turn left 2000 times to complete a 500 lap race. Amazing what these non-fans don't know.
I haven't been to a Nascar race, though Watkins Glen is fairly close to me. (That's Nascar, isn't it?) I've been to a few races on dirt tracks - those seemed much more exciting than watching racing on television. But, I think the best racing I've seen in person has been motocross racing. Those guys (and a few girls) are incredibly athletic. It has a lot of the strategies of, say, Nascar, as far as timing a pass, figuring out when to make your move, etc. I've known a few local stock car racers - I don't think you're required to be in top physical shape to, well, turn left. There's some endurance involved in driving a car for so long, but, you don't have to spend long hours at the gym lifting in order to be physically fit enough to even compete in the first place.