So soccer practice starts this week, and I am oh so not excited. Running is going to suck suck suck. Anyways, at practice I realized there was a lot of physics around me. As training, we run up and down the Kozuki Stadium stairs as training. We are each working in order to get to the top. The higher you go, the bigger the potential energy gets, while the kinetic energy goes down. When you come down the stairs, you use up that potential energy so it goes down, and your use of kinetic energy goes up. When a ball is kicked out of bounds, it is usually replayed with a throw-in. As the ball arches in the air and reaches its peak, the kinetic energy is zero and it is converted into potential energy. On its way down, potential energy is used up and turns it into kinetic energy.