« All Photo Galleries Jake Gyllenhaal’s Body Transformations Through The Years

Jake Gyllenhaal Buffed Up In 'Southpaw' (2015)

“I think he [Gyllenhaal] broke up with his girlfriend because he was just in the gym every day. He was training like a fighter. I had him sparring, really getting hit. I put him in situations where I wanted to see what he was made of,” said Southpaw director Antoine Fuqua.

The Weinstein Company