Most actors have to compete for parts through auditions. They need to be able to handle criticism and rejection. Once hired, actors spend hours memorizing lines and rehearsing. The workdays can be very long, especially on film shoots. In addition to reciting lines, actors need to be able to impersonate a real or fictional character, often right down to particular mannerisms, even regional accents. Stage productions usually require work in the evenings, on weekends, and holidays. Besides roles in movies, TV programs, and on stage, actors are employed in commercials, theme parks, and even teaching. Some roles call for singing and dancing. No formal education is required, although training at a university or dramatic arts school can refine important skills such as diction and movement. Actors can get performing experience in school or community productions, as well as in summer stock shows.