While Pratt isn't the first movie star to undergo weight fluctuations throughout the years (case in point: Jonah Hill ), it looks like the "Fit Chris" has a pretty good chance of sticking around for a while. Many of the more recent roles Pratt has taken on have required him to get into shape, starting with the first Guardians of the Galaxy.

Check out this Instagram post of Pratt's from 2013:

View this post on Instagram Six months no beer. #GOTG Kinda douchey to post this but my brother made me. A post shared by chris pratt (@prattprattpratt) on Jul 6, 2013 at 11:06pm PDT

So what's the secret to Pratt's success? Looks like a combination of lowering the beer count, some serious gym time, and a knack for being cast in roles that require the guy be ripped. Hey, if your job is dependent on you having a six-pack , it probably makes it a little easier to get yourself motivated to get your sweat on . And it appears that this trimmer Pratt won't be going away any time soon. He's currently filming for two sequels that kept him in top shape: the newest Avengers as his GOTG character, Star Lord, which is scheduled to be released in 2018, and the Jurassic World sequel, also scheduled for a 2018 release.

chris pratt zero dark thirty premier
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chris pratt zero dark thirty premier

Pratt's role Zero Dark Thirty had him built- but by the time the movie premiere rolled around in 2012, Pratt had packed on some extra pounds .

Pratt had packed it on, and we're not talking muscle. Check out this Instagram post, which documented his weight from around that same time.

View this post on Instagram Took this photo a year ago. A post shared by chris pratt (@prattprattpratt) on Nov 6, 2013 at 7:39pm PST

chris pratt parks and rec
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chris pratt parks and rec

Who could forget the lovable Andy Dwyer from Parks and Recreation? While literally anything Pratt said or did made us laugh, he was a lot different from the ripped Star Lord of today.

chris pratt guardians of the galaxy
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chris pratt guardians of the galaxy

The change started when Pratt took on the role of Star Lord in the first Guardians of the Galaxy, which was release in 2014.

chris pratt jurassic world
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chris pratt jurassic world

He's stayed pretty consistent since, dropping fat and building a lot of muscle.

chris pratt guardians of the galaxy 2
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chris pratt guardians of the galaxy 2

And here's the most recent of him, at a Guardians of the Galaxy Vol. 2 premiere in Tokyo, looking very trim.

Chris Pratt is living proof that change can actually happen. If you're ready to lose fat and build lean muscle, check out Superhero Shred from trainer Don Saladino, the man who has helped build Hollywood's biggest bodies.