Actors Who Made Major Body Transformations for Roles

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.

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

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

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.

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

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.

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

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.

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

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.