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The Best Body Transformations for a Movie Role

Rosie Huntington-Whiteley in Transformers: Dark of the Moon

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Leave it to Victoria's Secret model Rosie Huntington-Whiteley to be able to replace the beautiful Megan Fox—and look good doing it—in the action-packed thriller Transformers: Dark of the Moon. From crunches, planks, leg raises, sprint training, and, her favorite, boxing, you can bet she doesn't get that long and lean look without hard work.

AnnaSophia Robb in Soul Surfer

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AnnaSophia Robb hit the waves in Hawaii to train for her role as Bethany Hamilton, a teenage surfer girl who lost her arm in a shark attack. Before her surfing training started (which included 2-hour daily sessions with Hamilton), Robb spent two weeks in Colorado, swimming, practicing her breathing technique, strengthening her core, and working on balance and pop-ups. The petite blonde also also added more protein to her diet to boost strength gains and really feel look the part.

Malin Akerman in Watchmen

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Malin Akerman made the latex-clad Silk Spectre II look seriously bodacious in 2009's Watchmen. To prep for the role, Ackerman cut out all carbs—no bread, pasta, sugar, or wine—and stuck to a strict diet packed with veggies, salads, and yogurt. She also worked out with celeb trainer Logan Hood, who was constantly changing one variable in Malin's workouts to keep her muscles guessing.

Scarlett Johansson in Iron Man 2

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Scarlett Johansson had fitness blogs frenzied with reports that she shed her pin-up girl curves while training for 2010's Iron Man 2. The 26-year-old actress denied claims that she did any crazy crash dieting and looked like her fresh and fit self at the movie's premiere. Johansson revealed that she stuck to intense 90-minute workouts seven days a week for five months. Her training focused on balance, coordination, and core work, using standard moves like pull-ups and lunges, as well as kettlebell exercises.

Olivia Wilde in Tron: Legacy

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Olivia Wilde needed to get in warrior shape for her role in Tron: Legacy. The vegan celeb, who normally stays fit with Pilates and spinning, took on Capoeira, a Brazilian martial art, and upped her cardio sessions to an hour a day.

Jennifer Lawrence in X-Men

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Jennifer Lawrence had Hollywood buzzing over her breakthrough performance in Winter's Bone, and the 20-year-old Oscar-nominated actress isn't slowing down. Lawrence is taking on the role of Mystique in 2011's X Men: First Class. The fit actress told reporters she was "hungry for five months" while dieting for the role and worked out two hours a day with celebrity trainer James Duigan, who told us that Lawrence toned and lifted her butt so much that the X-Men costume designers had to remake her prosthetic!

Blake Lively in The Green Lantern

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Blake Lively took her already banging body to the next level for her role in the upcoming film The Green Lantern. She worked out with Bobby Strom, the same trainer who whipped Scarlett Johansson into shape for Iron Man 2, focusing on circuit training. Lively's 90-minute workouts included everything from planks and push-ups to lunges and plyometrics. The Gossip Girl star also stuck to a diet packed with oatmeal, fresh fruits and veggies, and lean proteins.

Halle Berry in Catwoman

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Halle Berry always looks like she's in superhero shape. For 2004's Catwoman, Halle amped up her 5 Factor Fitness workout and diet plan, created by Harley Pasternak. The plan includes 5 minutes each of warm-up, upper-body toning exercises, lower-body strength training, core work, and cardio. Check out how Pasternak keeps his other A-list clients get in amazing shape.

Jessica Biel in Blade: Trinity

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Jessica Biel, one of Hollywood's sexiest starlets, credits Blade: Trinity for changing her fitness and diet routine. Biel followed a very strict diet—no sugar, flour, dairy, or salt—and was in the gym six days a week, doing martial arts, archery, and circuit training.

January Jones in X-Men

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January Jones left her prim and proper Mad Men role behind to play the racy Emma Frost in 2011's X Men: First Class. Jones says she didn't diet, but lifted weights to add curves to her petite frame.

Zoe Saldana in Avatar

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Zoe Saldana had to get in out-of-this-world shape for Avatar. The former dancer trained six days a week, challenging her body with a combination of archery, horseback riding, and Wushu, the first known form of martial arts.

Jessica Alba in Fantastic Four

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Jessica Alba transformed into the Invisible Woman in 2005's Fantastic Four and 2007's 4: Rise of the Silver Surfer. Alba cut down on snacking and favored a diet high in fiber and protein. She also worked out with celeb trainer Ramona Braganza, doing five or six weekly workouts full of squats, lunges, and core work, using medicine balls and a foam roller.

Jennifer Garner in Daredevil

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Jennifer Garner is no beginner when it comes to kicking butt. The Alias alum could write the book on getting fit for action-packed roles. To become Elektra in 2003's Daredevil, Garner ate five or six mini-meals a day, totaling around 1,600 calories. She also worked out five days a week, focusing on cardio, circuit training, and Pilates.

Uma Thurman in Kill Bill

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Uma Thurman started her Kill Bill training just three months after giving birth, and director Quentin Tarantino had no intention of going easy on the new mom. Thurman did everything from kung fu and sword fighting to knife throwing and hand-to-hand combat to prepare for her most memorable role.

Angelina Jolie in Tomb Raider

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Angelina Jolie had to be in amazing shape to embrace her role as Lara Croft in 2001's and 2003's Tomb Raider installments. Jolie's training included everything from yoga and kickboxing, to sword fighting and weapons training, to bungee ballet and diving.

Natalie Portman in Black Swan

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Natalie Portman trained for an entire year for her Oscar-winning role in the ballet thriller Black Swan, working with former professional ballerina Mary Helen Bowers for up to 8 hours a day. To help Portman build a strong, slim ballerina body, Bowers supplemented ballet classes with swimming, cross-training, and endurance exercises. Click here to get Portman's Black Swan ballet workout.

Sienna Miller in G.I. Joe: The Rise of Cobra

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Sienna Miller had to bulk up her diminutive frame for her role as the Baroness in G.I. Joe: The Rise of Cobra. Miller spent four months getting fit for the role, training with a former MI6 agent (yes, as in James Bond's agency), boxing for an hour each day and hitting the weights.

Hilary Swank in Million Dollar Baby

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Hilary Swank put on 19 pounds of muscle for her Oscar-winning performance in Million Dollar Baby. The actress completed 4-hour workouts six days a week, boxing and lifting weights. Swank packed in 210 grams of protein each day by eating egg whites and drinking protein shakes as often as every 90 minutes.

Demi Moore in G.I. Jane and Striptease

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Demi Moore went from overtly sexy in 1996's Striptease to over-the-top svelte in 1997's G.I. Jane. Moore has since told reporters that she was obsessed with working out to prepare for these roles and that she is now kinder to her body, staying super fit with Pilates, walking, and light weight training.

Ashley Greene in Twilight

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Ashley Greene has one of the hottest bodies in Hollywood, and the athletic actress, who frequently works out with celeb trainer Tracy Anderson, isn't afraid to break a sweat. To prepare for her Twilight installments, Greene hit the gym for an hour a day, focusing on cardio, squats, planks, and kettlebell training.

Linda Hamilton in Terminator 2

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Linda Hamilton didn't mess around when it came to her Terminator 2 training. Running, biking, swimming, and stair climbing made up the cardio portion of her 3-hour workouts. The actress also used free weights and abdominal series to get so svelte and sculpted that even Arnold was impressed.

Gwyneth Paltrow in Iron Man 2

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People could not stop talking about Gwyneth Paltrow's insane body—those legs!—during the Iron Man 2 press circuit. Paltrow is the first to admit she worked her butt off to get in top shape for the film and swears by trainer Tracy Anderson. Anderson developed a 26-minute mat workout to specifically target Paltrow's gams and also worked with the actress on an arm series and 45-minutes of dance cardio.