There's a Battle of the Buff Bods on the set of "Pain and Gain" in Miami -- and while Mark Wahlberg is looking bigger than ever ... he's no match for The Rock!

Wahlberg and Dwayne "The Rock" Johnson were both snapped on set yesterday, where they both showed off their incredibly built physiques by wearing tank tops.

According to the official synopsis, the movie revolves around a pair of bodybuilders who "get caught up in an extortion ring and a kidnapping scheme that goes terribly wrong."

Check out more buff bods in the gallery below -- and see if you can match the star with their arms!


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