Transforming into Lieutenant Jordan O’Neil, the first female Navy SEAL, for the movie G.I. Jane was not an easy task. The Demi Moore workout and diet are what she used to become G.I Jane, and included real Navy SEAL training, combined with a lot of strength, cardio, and martial arts.
For G.I. Jane, Moore’s workout would start at 4:00 am, in order to finish before filming started. Living in New York City at the time, she had multiple security guards following her while running in Central Park.
She used celebrity trainer Gregory Joujon-Roche for getting in shape, and Navy SEAL instructor Stephen Helvenston to gain that visceral, Navy SEAL mindset while filming. To immerse herself in the role she shaved her head, did Navy SEAL obstacle courses and other military-type exercises such as underwater running, one arm pushups and sit-ups in the mud.
(Source: Pop Workouts)