[On losing 63 pounds for The Machinist] "I had a stupid kind of feeling of invincibility, like, 'I can do it, I can manage it'. I really did feel like I hit this point of enlightenment."
[On transforming into Patrick Bateman for American Psycho] "The character is so vain and obsessed with his looks. While the psychology of the character was something that I could perform, you can't fake the physicality. Being English, I tend to enjoy going down to the pub far more than going to the gym, so it was very unnatural for me. I just had to convince myself that I loved it, which was the most difficult thing about playing this part. Working out is incredibly boring. I swear it's true that the bigger your muscles get, the fewer brain cells you have. I found I had to stop thinking when I was in the gym because if I thought about it, I'd realize how ridiculous it was that I was pumping iron when I could've been out having a drink and a cigarette and enjoying some lunch. I did three hours a day for six weeks with a personal trainer and some time before that. I ate an awful lot during training and then almost nothing during filming."
[On gaining weight for Batman Begins] "You couldn't pull it off unless you became a beast inside that suit... At the time that [Christopher Nolan] asked me to do it, I actually couldn't do one push-up. They sent me to a trainer, who was having to hold my T-shirt at the back just to pull me up. I've come a long way from that."