A lot of celebrities credit their work for their fabulous physiques. Actors aren't exactly stuck behind desks, and while some films and shows certainly require them to be more sedentary than others, they all require the actors to get up off the couch.

Liv Tyler is a great Fit Celeb role model. She keeps her figure lean and healthy without resorting to any extremes. She says she loves working out and loves the feeling of breaking a sweat, but admits that a lot of her workouts revolve around her work. For her last two movies, The Strangers and The Incredible Hulk she was required to do lots of running, screaming, crawling, and jumping, all day long.

Christina Ricci showed off how strong her training for her latest movie, Speed Racer, made her. She showed off her skills on Last Call with Carson Daly by doing a one-armed push-up, all while in heels.Hayden Panettiere says being on Heroes is a big part of how she stays in such amazing shape. She loves doing her own stunts because she doesn't have time to go to the gym or be on athletic teams, and the stunts are a great substitute.