She is today the most recognizable face in the Jiu-Jitsu community. Mackenzie Dern turns 24 years old this Friday, March 24. After winning all she could hope for with the gi, Dern has transitioned to MMA is already making huge headlines. Just recently, UFC President Dana White said that he’s been paying attention to Dern’s first three MMA bouts (she is 3-0). Here you find Mackenzie teaching a clever setup for the triangle starting at the spider guard. Go train.