Dustin Hoffman - Marathon Man

For Marathon Man (1976), Dustin Hoffman didn't shower, sleep, or change clothes for four days to embody his character's exhaustion. As a committed method actor, Dustin Hoffman also ran half a mile before each take to appear genuinely out of breath. His intense preparation prompted co-star Sir Laurence Olivier to famously quip, "My dear boy, why don't you try acting? It's so much easier."

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