If you ever see a track athlete wearing special shoes for the track and wondered if their is an actual purpose of them, their is. On a track while you run, no force is acting directly on one another. While you run, the force of static friction holds your foot has you push yourself forward. The reason for track athletes to wear these special shoes is to increase to value of static friction between the track and their foot. When running at very fast speeds, as track athletes tend to do, any energy that could be lost to friction cannot be afforded by the track athlete. Without track spikes, track athletes would not be able to travel at the speeds that they do.