Originally Posted by Matt Ldn
The best I've ever seen a boxer look in a film was Daniel Day-Lewis in "the boxer" and I think he was trained by McGuigan or his brother (the film was based to a small degree on McGuigan) for about 18months.
And Daniel Day-Lewis takes dedication for the role to a whole new level.
Robert De Niro had a few boxing matches when he was preparing for Raging Bull. He won a couple, too.