Downey had an office next to Favreau during pre-production, which allowed him greater involvement in the screenwriting process, especially adding humor to the film. Downey explained, "What I usually hate about these [superhero] movies [is] when suddenly the guy that you were digging turns into Dudley Do-Right, and then you're supposed to buy into all his 'Let's go do some good!' That Eliot Ness-in-a-cape-type thing. What was really important to me was to not have him change so much that he's unrecognizable. When someone used to be a schmuck and they're not anymore, hopefully they still have a sense of humor." To prepare, Downey spent five days a week weight training and practiced martial arts to get into shape, which he said benefited him because "it's hard not to have a personality meltdown ... after about several hours in that suit. I'm calling up every therapeutic moment I can think of to just get through the day." The revelation at the end of Iron Man of Stark's alter ego was improvised by Stark's actor Robert Downey Jr.
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