McAdams said she tried a bit of boxing to see what it was like, but couldn't do anything near what Gyllenhaal pulls off in the film.
"It was all him, there was no stunt double. And boxing's hard," she gushed. "It's so difficult."
Gyllenhaal said he trained "five hours a day" for months and months. Despite giving his all physically, he didn't have to abide by any strict diet. "
There wasn't a lot of deprivation but when I first started training, [director] Antoine [Fuqua] I ate a lot of chicken wings and then they took the chicken wings away. That was the extent of it," Gyllenhaal joked to E! News. "I eat relatively healthy anyway but when you train that much, you can kind of eat what you want. A lot of Chipotle!"
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