Emily Blunt
The star geared up to play a super soldier in Edge of Tomorrow with the help of a diverse routine, including gymnastics, weight training, Krav Maga, sprint training and wearing a weight vest.
"I prepared as much as I could, and then the first day when I showed up and put the suit on, I just thought, 'Oh god I'm going to start crying,'" she told Entertainment Weekly at the time. "And then you get used to it, and it becomes like second nature."
Kate Beckinsale
The actress has put on Selene's signature bodysuit for five installments of Underworld, every time resorting to a six-day regimen of circuit training and "brutal" cardio.
"The thing I like about circuit training is that you're never doing one thing for very long," she told Shape. "You get to the point where you almost can't bear it, and it changes to something else."
Jennifer Lawrence
To live through The Hunger Games, the star had to get in shape for survival mode with the help of archery lessons and tree and rock climbing sessions.
Gal Gadot
Before she put on Wonder Woman's suit to shoot Batman v Superman: Dawn of Justice, the actress spent nine months training. She got so fit, her proud husband felt a bit more pressure to work out.
"He started training more because I became so strong," Gadot told E!'s Maria Menounos.
Angelina Jolie
To embody video game heroine Lara Croft on the silver screen twice, the Oscar winner boxed, lifted weights and overall bulked up to look the part and tackle many of the demanding fight scenes and stunts herself.
Halle Berry
To portray the slinky comic book character, Catwoman, Berry had to be both strong and lean, so trainer Harley Pasternak had her circuit train on set during lunch breaks and kept her energy high with multiple small meals throughout the day.
Anne Hathaway
For her own rendition of Selina Kyle in The Dark Knight Rises, the Oscar winner said there was not secret to her regimen for getting catsuit-ready—going to the gym and watching what she ate for ten months.
Demi Moore
In order to successfully portray a lieutenant going through grueling Navy training in G.I. Jane, Moore had to be able to perform the routine herself, so she hit the gym with a real-life Navy SEAL.
HIlary Swank
The actress won her second Oscar for her authentic portrayal of a defeated boxing champion in Million Dollar Baby, but in order to win the gold off-screen, Swank got into character by training in the ring for hours a day just like the pros.