How Scarlett Johansson Slimmed Down for The Avengers

Scarlett Johansson kicks major butt as Black Widow in The Avengers, saving Earth from imminent doom, all while wearing a black catsuit. Between slipping into a skintight costume and unveiling some serious moves against Loki's army, this wasn't a character the star, 27, rolled out of bed for. To prep for the physically demanding role, she worked for almost two months with trainer Bobby Strom and her stunt double Heidi Moneymaker. Keep reading to see how the blonde beauty got herself in svelte shape for the role.

PHOTOS: More actresses who have slimmed down for a role

The power of circuits: Strom, who also trained Johansson during Iron Man 2, says he used a similar training program for her reprisal of this role: 90-minute circuit workouts, multiple times per week. The goal was to get her ready for those explosive on-screen movements. Strom kept things varied through the use of dumbbells, resistance bands, medicine balls, and TRX; workouts were built around sets of 20, with 25 to 30 reps of each exercise. Strom also had the star doing running intervals, both in and out of the gym. Get in superhero shape like Johansson did by finishing our full-body circuit workout with weights.

PHOTOS: Behind the scenes of The Avengers

Combative training: One of the first scenes in The Avengers shows Johansson fighting off multiple members of the Russian mob, something which Moneymaker helped her prepare for. A longtime stunt double in the industry, Moneymaker says she and the actress had about six weeks to prepare for the various fight scenes in the movie, using elements of mixed martial arts (MMA) and "hand-to-hand combat and weapons training." Speaking of the role, Johansson told Vogue, "You get beat up a lot," she says. "It's painful." Get a little MMA into your own life by doing this video workout with former Biggest Loser trainer Brett Hoebel.

PHOTOS: Eat like a star with these celeb diet plans

An (almost) vegan diet: The actress arrived on set already following a healthy diet plan, one that Strom describes as "mostly vegan." He says she focused on eating several small meals each day. As was the case during Iron Man 2, there was a lot of oatmeal, fresh fruits and veggies, salads, and lean proteins.

Related Links:

PHOTOS: How Jennifer Lawrence transformed into Katniss Everdeen

PHOTOS: Jessica Biel, Minka Kelly, and stars who love to work out

PHOTOS: How Jessica Alba stays healthy and fit

PHOTOS: Reese, Heidi, and more stars who love running

This article originally appeared on Usmagazine.com: How Scarlett Johansson Slimmed Down for The Avengers