Example of jumping. In this section, we'll look at energy in ice skating. So an ice skater flying across the ice has lots of kinetic energy. If the movement is rotational instead of straight-line, then the equations are similar. The idea is the same - how fast the skater is spinning is directly related to her kinetic energy.
Potential energy is stored energy.
Muscles act like springs, so the chemical potential energy of muscles is converted, by the muscle applying a force, into kinetic energy of motion. When she jumps, she's also converting her chemical potential energy into kinetic energy. There, all of her former kinetic energy is now gravitational potential energy. As she falls back down, her potential energy is converted back into kinetic energy. At the moment she hits the ice, all the gravitational potential energy she had at the jump' s peak is again kinetic energy, so she hits pretty hard.