Finally given the go-ahead to play the role, Christian Bale underwent a rigorous preparation period. He even got major dental work done in the fear that a gap between his front teeth just wasnt right for Bateman. I liked my old teeth. I have a moulding of them on a shelf, he later lamented to The Guardian. He also explained in the same interview that working out took over life. Its believed that he spent months working out on his own before pre-production had even begun. And when it did, he worked with a personal trainer for three hours a day in a bit to achieve what Bateman describes in the source novel as an Olympian physique. And he didnt stop at that, either. Do you remember Batemans lengthy cosmetic routine from the opening scene of the film? Well, Bale actually did all of that during American Psychos production. He procured all the necessary products and applied them daily as the script suggested, presumably in a bid to enter the mindscape of the serial narcissist he was portraying. On top of all this, Bale also took inspiration from some unexpected places to nail down his portrayal of Bateman
