Running is a very simple task, it's just rapid leg movements, along with arm swinging, through long strides while on foot. To be considered a running act, both feet must be held off the ground at short, regularly spaced intervals. Believe it or not, there's actually a lot of physics behind running. There's the runner's speed, the length of each step he takes, the energy you use and how to conserve it, and then there's the law of the pendulum. The runner's speed is very easy to determine. It's just your stride length multiplied by your stride rate, for example if you walk five feet in one step and take three steps per second, your speed will be 15 feet per second. Basic mathematics. However, there are three different types of stride length: takeoff, flight, and landing distance. Takeoff distance is the distance at which the center of mass of the body is in front of the toe of the front foot at the instant the rear foot leaves the ground. Flight distance is the distance the body COM travels while the runner is in the air. The landing distance is the distance to the tip...