Mickey Rourke played a fake fighter in "The Wrestler" -- but he was scrappin' FOR REAL this week during a hardcore MMA training session in L.A. with Jay Glazer. The "NFL on Fox" star hit the mats with Rourke at his "Unbreakable Performance" MMA gym -- the place he co-owns with retired NFL star Brian Urlacher.
Glazer says Rourke's been "training his ass off" ... though it's unclear if he's doing it for fun -- or if he plans to actually compete ... which is unlikely since he's 62-years-old.
FYI -- Rourke is no stranger to combat sports ... he famously boxed back in the '90s after he had already established himself as a Hollywood star.
Still, 62 and training in MMA ... not bad.
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