Speaking in energy terms, how do you ride your bike up a hill?
Well, we eat food in order to get energy. Energy from food is called chemical energy. The chemical energy is a form of potential energy since it gives you stored energy. You use this energy to ride up the hill.
What if you were so tired by the time you got to the top that you had no energy left to pedal back down? I hope you're thinking about gravitational potential energy!
Just go to the edge of the hill and let the brakes go! You'll release the stored gravitational energy and turn it into kinetic energy, the energy of movement.