Most wrestlers are superb athletes who practice for many hours each day to stay in shape. They rehearse for years to master the maneuvers as well as how to perform them safely while making them appear risky. They sustain numerous injuries, some of which are serious. Their schedules are quite demanding. Wrestlers, unlike stunt performers, perform their choreographed competitions in one take in front of a live audience. Great wrestling is half complicated choreography and part improvisation, with wrestlers feeding off each other and the audience to produce a one-of-a-kind piece of art.