Competition. It's what pushes many of us to achieve our goals and take on new challenges. Be it in football or academia; video games or drinking games, the impulse to do what we must to win exists in all of us. People are willing to go to extreme lengths to be the best in their field, with top athletes putting in hours upon hours of gruelling training just to try to be number one. With that in mind, we've gathered 13 images that exemplify the spirit of competition.