One of the my favourite sport is Formula 1, although many people consider that is not a sport because the drivers don't move and stay all the race sit in the car, but is one of the harder sport.
The racing driver can lose three or four kilogrammes in one race. This is the reason that the more important in one race, except the concentration, is drink a lot of water. They have a small water tank behind them and through a little hose they can drink.
one other important aspect that they need to keep are the muscles in their neck, because is the part of the body that is more affect, because when they drive a car in one bend near 270 km/h the G strength are very hard, for example if the normal people do it, is very probable that you break one's neck.
In my opinion it is one of the more spectacular sport, because the racing drivers can arrive with their cars near 340 km/h, and it is very dangerous because a very little absent-mindedness can be mortal.