Special Report

Actors Who Made Major Body Transformations for Roles

Source: Kevin Winter / Getty Images Entertainment via Getty Images

Christian Bale

To prepare for the role of insomniac Trevor Reznik in this psychological thriller, the British actor reportedly ate just one can of tuna fish and a single apple per day.

Source: Courtesy of Filmax

Christian Bale
> Movie / TV series: The Machinist (2004)

He dropped over 60 pounds in the process and weighed as little as 110 pounds during the filming of the movie.

Source: Christopher Polk / Getty Images Entertainment via Getty Images

Chris Hemsworth

Before joining the MCU, Aussie star Chris Hemsworth cut a relatively lean physique.

Source: Courtesy of Paramount Pictures

Chris Hemsworth
> Movie / TV series: Thor (2011)

With help from personal trainer (and former Navy SEAL) Duffy Gaver, the actor bulked up for the role of Thor. He was similarly beefed in subsequent Marvel movies.

Source: Michael Tran / FilmMagic via Getty Images

Chris Pratt

Chris Pratt’s most adoring fans still remember him as pudgy Andy Dwyer in the comedy series “Parks and Rec.”

Source: Courtesy of Walt Disney Studios Motion Pictures

Chris Pratt
> Movie / TV series: Guardians Of The Galaxy (2014)

For the role of Peter Quill aka Star Lord, the actor adopted a strict diet and fitness regimen. He lost 60 pounds in about six months while simultaneously building muscle.

Source: Courtesy of Open Road Films

Jake Gyllenhaal

The once somewhat scrawny star of movies like “Donnie Darko” completely reinvented himself for the 2015 boxing drama “Southpaw.”

Source: Courtesy of The Weinstein Company

Jake Gyllenhaal
> Movie / TV series: Southpaw (2015)

He reportedly worked out for as much as six hours per day for six months in a row. Early stills showed Gyllenhaal raging in the ring, his body covered in muscle.

Source: Courtesy of Paramount Pictures

Jonah Hill

After gaining 40 pounds for his role in 2016’s “War Dogs,” Hill started hitting the gym on a regular basis.

Source: Courtesy of Netflix

Jonah Hill
> Movie / TV series: Maniac (2018)

He was noticeably slimmer by the time he appeared in this surreal Netflix series, about two strangers who undergo a mysterious pharmaceutical trial. The actor routinely gains and loses weight and not always in tandem with an upcoming performance.

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