How committed is Jake Gyllenhaal to his latest role? This much

Jake Gyllenhaal was most recently seen on cinema screens as a creepy video journalist in Nightcrawler, a role for which he lost more than two stone.

When audiences next see him, however, he will be almost unrecognisable as a middleweight boxer in Southpaw.

We literally turned him into a beast. Jake, my God, he's a very electric, powerful fighter in this movie. He's so committed and gives his heart. The word is sacrifice.

• Southpaw director Antoine Fuqua, speaking to Deadline Hollywood

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Review: [Nightcrawler]4