See Jake Gyllenhaal's crazy physical transformation in the first Southpaw trailer

Last year, the internet went wild over a picture of Jake Gyllenhaal in the upcoming boxing drama Southpaw. In order to convincingly play a middleweight boxing champion, the actor put on 15 pounds of muscle, resulting in a ripped physique that's miles away from the emaciated creep he played in Nightcrawler. Now, with the first Southpaw trailer, audiences can actually see Gyllenhaal in action:

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Southpaw also stars Forest Whitaker, Rachel McAdams, and 50 Cent. It hits theaters on July 31.

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