Usain Bolt holds the world record for being the fastest man alive. Runners require an incredible amount of strength because the stronger their muscles are the more strength they have to exert and push off the ground as they run.

Olympic athlete, Jenny Simpson was injured after the 2008 Olympics as a direct result of repeated stress on her legs and feet from running. The risk of injury for runners is higher for their joints and bottom torso because of the constant impact of forces on their bodies.

George helps one of his friends prepare for a race by becoming her personal trainer.

Martha gets arrested for something he didn't do. This video explains that you will get in trouble for being in the wrong place at the wrong time, and the result would be going to jail.

Leslie and Ben are trying to decide who should run for govenor. Ben understands that it is is a dream that Leslie has always had, and lets her run instead of him.