Your mom's Zumba class just got HARDCORE ... 'cause TMZ Sports has learned, UFC face-smasher Mark Munoz is taking up dancercise -- and we dare you to crack a joke (at least to his face).
Munoz -- who's currently ranked #7 in UFC middleweights -- hit up the LA Fit Expo on Saturday ... where he fulfilled his New Year's Resolution of (that's right) learning Zumba.
And guess what -- Mark says he loved the class so much ... he's actually considering using some of the moves in his regular MMA workout routine.
Check out the clip ... once you see the girls in this class, it'll all start making sense.
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