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NFL star Brandon Marshall is about to blow your mind -- 'cause it's not every day you meet a wine, yoga and Pilates lovin' football star!

We caught up with the Chicago Bears' wide receiver at the Playboy Mansion -- probably not the best time to remind him training camp starts in 9 days, but we did ... and his response was awesomely honest.

"It sucks. Right now ... you got stuff like Espys and Playboy parties. Now you gotta go to camp, you gotta go to a dormitory for a month?"

Brandon also revealed he and Jennifer Aniston have more in common than we would have ever thought -- you gotta see him light up talking about his love of Pilates, yoga ... and fine wine.