There are some seriously buff bods hitting theaters today in "Pain & Gain" -- and to celebrate, we've tracked down some of the best biceps in the biz.

While Dwayne "The Rock" Johnson, Mark Wahlberg and Anthony Mackie all had to bulk up for their roles as bodybuilders in the flick, other big name celebs show off their chiseled arms every day.

We appreciate it, we really do.

Check out the gallery above to see if you can identify a star by their biceps alone. Good luck!

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