If it has a motor, it ain't a sport.
its a deadly sport. I posted an article written by an Indy car driver about how in shape one has to be to drive Indy/Champ, ralley, GT and F1...you don't have to be that in shape for NASCAR due to the oval racing. But those who race on circuits---street, etc., you must be in shape as the G forces from all directions take a lot out you. Formula 1 driver Jenson Button runs marathons.
The writer of the article had said that when he first tried out for a team, he was so unprepared for dealing with the g forces and man handling the car, that he stopped and gave an excuse that he had to pee. But he went to bathroom for a breather and to throw up.
Tony Stewart used to be in shape when he raced Champ/Indy, now as a NASCAR driver he's not that in shape.