5) Leonardo DiCaprio in The Revenant
Leonardo DiCaprio was super dedicated in his role for The Revenant. DiCaprio went and lived outdoors in extreme conditions of the Canadian wilderness in order to understand the mindset of his character. In fact, despite being a vegan in real life, he even ate raw animal liver to add authenticity to his scenes. If that wasn't enough, he even submerged himself in freezing water and performed his own stunts.
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Edited by Mudeet Arora