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Mickey Rourke The Wrestler Becomes ... The MMA Fighter!

10/16/2014 12:17 PM PDT

Mickey Rourke -- The Wrestler Becomes ... THE MMA FIGHTER!

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. Watch TMZ Sports on FS1 Get the new TMZ Sports app!


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