Jonah Hill has had to alter his weight for a few of his movies - first losing it alongside Brad Pitt in Moneyball, then gaining it for War Dogs. It's been his own motivation to get fit for good, though, something he often credits to maturity in interviews. Back in March, he even told Jimmy Kimmel that Channing Tatum gave him a little advice:

I gained weight for this movie War Dogs, and then I wanted to get in better shape, so I calledChanning Tatum, and said, Hey, if I ate less and go to a trainer, will I get in better shape? and he said, Yes, you dumb motherfucker, of course you will;its the simplest thing in the entire world.

And DAMN, is it working! Jonah has always been great, of course, but this transformation is impossible not to notice. I bet there's protein in that smoothie he's drinking.

And then there's the obvious: With fitness often comes lots of body confidence, which means we could just see nudity coming from this gent.