I don’t know anything about race car driving- but I’d be willing to bet if you rode a race horse, even a slow one at training speed you would get a new appreciation for the athleticism of jockeys. They do far more than just sit there. Great, and even good jockeys have to be in top physical condition- and have to be mentally smart (lot of strategy involved to work out in very short time) and mentally tough. It is one of those jobs that is not
anywhere near as easy as the good ones make it look.
Yes, the jockey/driver can be well conditioned but the primary effort is being done by the horse/car.
Horses are amazing athletes - cars are simply mechnaical devices.