> The F1 guys are probably as fit as a top footballer. They're dealing with black out levels of lateral G forces whilst slamming on the brakes within a fraction of a second of loser times or crashing out.

I don't think it ever got to that point in F1, but CART (now IndyCar, but that's a different discussion) had to cancel a race because drivers were blacking out due to sustained G forces.

https://www.youtube.com/watch?v=F5dsuYZCZJ0