This is awesome -- UFC star Dominick Reyes teaching us exactly how he landed those CRUSHING uppercuts on Jon Jones ... WELCOME TO FIGHT SCHOOL!!!
Dom hit up the secret gym at the TMZ offices recently -- where he told us straight up, "I definitely won" that fight.
Remember, 30-year-old Reyes took Jones the distance in their Feb. 8 matchup at UFC 247 -- a lot of people think he deserved to win that fight and got screwed on the judge's cards.
So, when Reyes hit up our gym -- he took our resident punching bag, Lucas, to class (with the help of "Fight School" host Paige VanZant!).
Ya gotta watch the whole ep on Snapchat -- Dom shows us how he baited Jones during the fight so he could land those devastating shots.
He also tells us he's dead set on a rematch -- and this time, he won't leave it up to the judges!