Jake Gyllenhaal Knew Nothing About Boxing Before 'Southpaw'

Jake Gyllenhaal poses with some Navy men and women while screening his new movie Southpaw at Navy Base San Diego during 2015 San Diego Comic-Con on Saturday (July 11) in San Diego, Calif.

The 34-year-old actor recently opened up about how he trained for the film.

PHOTOS: Check out the latest pics of Jake Gyllenhaal

“I knew nothing about boxing when I started really, and I knew that in order for me to pull it off in any way, I was just gonna have to learn to do it,” Jake said (via People). “And when I set my mind to something I just won’t stop until I do it. It’s something I pride myself on, and it’s something I hate about myself.”

10+ pictures inside of Jake Gyllenhaal at the San Diego screening…