Tom Hanks as Chuck Noland – Cast Away (2000)
“Relentless is our goal. Relentless! ”
True to his word, Hanks was relentless in this role, so much so that he at first had to gain 50 pounds during pre-production to shoot the scenes of his character when he was a middle-aged man.
Shortly after that, he had to lose nearly 60 pounds in 4 months to play as the castaway. During this time the dedicated actor spent at least 2 hours a day in the gym and ate mostly fish and vegetables so that he did not have to go hungry in between shoots. This also allowed him to have much better control over his physique for filming.