Want to get as ripped as Jake Gyllenhaal in Southpaw? This is how he did it.

Coming less than a year after Jake Gyllenhaal's turn as a skinny creep in Nightcrawler, the actor's physical transformation in Southpaw — in which he plays a professional boxer — is nothing short of astonishing. Beefed up to bulky, muscular proportions, Gyllenhaal is totally credible as the kind of guy who could send just about anybody sprawling to the mat.

But how did he get into fighting shape so fast? As you'd expect, it wasn't easy — but a series of interviews have offered some...

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