Jake Gyllenhaal gains some serious muscle for upcoming film “Southpaw”

JAKE Gyllenhaal has packed on some serious muscle for a new movie. So much so, that he is now completely unrecognisable.

JAKE Gyllenhaal isn’t exactly known to be your typical big guy in Hollywood.

But to get into character for an upcoming film, he has transformed into a completely different person.

Gyllenhaal packed on 7kg of pure muscle to play Billy “The Great” Hope, a championship prize fighter for next year’s Southpaw. Like any boxing drama, his character has lost everything in a personal tragedy and is forced to fight his way back through his boxing dream.

The incredible transformation of Jake Gyllenhaal for upcoming boxing drama 'Southpaw.' #actors #movies pic.twitter.com/DjYvSPRgbz

— Golden Globe Awards (@goldenglobes) November 29, 2014

This isn’t the first time Gyllenhaal has had to dramatically change his weight for a role. He lost around 10kg last year to play the adrenaline junkie camera man Lou Bloom in this year’s thriller Nightcrawler.

Jake Gyllenhaal looking much skinnier in Nightcrawler.

Similarly, Matthew McConaughey made a huge weight shift going from big and muscly in Magic Mike to extremely skinny in the Oscar-winning Dallas Buyers Club.

To this.

From this.