Wanna REALLY kick someone's ass? Pay attention ... Master Van Damme will teach you.
In fact, Jean-Claude Van Damme says most of the badass fighters in the UFC don't really know how to execute a proper leg strike, so he gave TMZ Sports a FULL KICKING TUTORIAL to show us how it's done.
"Right now, it's a mess," Van Damme said of the kicking in the UFC ... "they are missing, they are out of balance. Thank god they have good jiu-jitsu."
But JCVD didn't just talk the talk -- he pulled over a buddy and gave us a full demo on the street!
"If I can give some of my knowledge to some of those amazing UFC fighters in terms of legs, I have a lot to teach."
Watch. Learn. Take notes.