Have you ever wondered why a runner stretches before they engage in their race? The reason for stretching is to loosen up in order to minimize or prevent the chance of injury. It is essential that a runner do this prior to every time they start their run. If they don't then there is a much greater chance of injury. This is not a favorable outcome for a runner. An injury may mean that they can't continue running either that day, that week, or maybe even longer.