It's hard to imagine waify Demi as a hard-body, shaved-head Navy operative, but the actress massively bulked up for G.I. Jane (1997). Moore spent hours training rigorously under the direction of a real-life Navy SEAL and performed all her own stunts - who could forget those single-arm push-ups?
The ageless beauty now prefers a more Zen workout - she's into Bikram yoga.
Actress Demi Moore, with closely-cropped hair, attends a party following the premiere of "Striptease," at the Ziegfeld Theatre in New York Sunday June 23, 1996. Moore stars in the film which was directed by Andrew Bergman and produced by Mike Lobell. (AP Photo/Albert Ferreira)