The fastest car wins the race, but you also need to be fit and skilled enough to be able to control the fastest car. if you are not fit enough then the bumps and quick turns will quickly take a toll on your body and you might be able to control the car in due time.
The idea here is to defeat your rivals and come up as the winner. You need to be able to quickly turn your car around as there are lots of quick turns in this game. If you can't do that then you can't simply win the game.