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Body doubles are usually models that have developed very good bodies by exercising and by eating well. Often, movies or television shows that use body doubles do not admit that a body double model was used. 
Another job in the movie and television production industry where people do actions that the actors or actresses do not want to do is the job of stuntman. A stuntman is a person who does dangerous actions in movies, for example, jumping, falling, getting in a car accident, or pretending to fight with knives.
What distinguishes a "stunt person" from a "stunt double" is the particular character they portray. If the character in question is a main character and/or central to the plot and uniquely identifiable, the stuntman is then typically referred to as a "stunt double" in the credits.
- Double take: behind every 'Pretty Woman' stands a prettier woman, a superfit body double to the stars American Fitness, July-August, 1992 by Michael Loprete http://188.8.131.52/search?q=cache:atj9-A8DVX0J:www.findarticles.com/p/articles/mi_m0675/is_n4_v10/ai_12448376+body+double&hl=en&ct=clnk&cd=14
- IMDb.com, "Pretty Woman" cast credits, http://www.imdb.com/title/tt0100405/combined