Do you how a sprinter trains for a race? They sprint! They focus on getting to their goal - the finish line - as quickly as possible. They use all their physical and mental resources to achieve their goal as quickly as possible. If you have watched top-level sprinters on television, you can see the intensity in their faces. They are hell-bent on staying one stride ahead of whoever is next to them. Their muscles flex, veins pump with blood, and eyes are fixed ahead. They do not let up for a second. Tiny mistakes have giant consequences in a sprint race - there is very little margin for error. What about running a marathon?