Jake's Transformation for Southpaw.

There is no way he build that much muscle naturally.

I'm curious to know how he built all that muscle after losing so much weight for Nightcrawler.

I read he had about six months between completing Nightcrawler and beginning Southpaw filming to build it. That's about the common timeline I've read for a lot of the actors who bulk up for superhero films.

6 hours a day he said.

He looks awesome!

This guy keeps impressing!

As someone with a few years of natural powerlifting experience, I concur. No way someone could recover and gain that fast without steroids. Obviously it would take a lot of hard work too, but if any Hollywood star claims they've achieved such things without "help", they're flat out lying.

They only avoid the issue because many don't approve, for good reason. Simple as that.

He would have naturally put back on his normal muscle mass very quickly after dieting down (your body won't let you stay so low below it's normal weight- you bounce back really quick) and then it was a matter of him working out every day for however long (6 months?). It is possible, Jake is naturally jacked and has the right body type to do it.