If you want to be number one in a sport, you need the right muscle fiber type! You're either the slow type, the fast type, or something in between. And it's true that a slow muscle fiber type will never win a 100-meter sprint. Never. No matter how hard they train. Sports scientist Eline Lievens (Ghent University) explains why this is so and how you know which type you are. And therefore, which sport you can excel in!