Floyd Mayweather made the most of his downtime cameoing in Armani White's new music video -- he actually taught the Def Jam artist some of the tricks that kept him an undefeated champ!!!
TMZ Hip Hop got clips of Floyd showing Armani the ropes outside the ring at his TMT gym ... where they'd been shooting the rapper's "GOATED" video. In between takes, Armani's face was all business while soaking up the 50-0 prizefighter's tips ... which included some footwork pointers, lessons on the heavy bag and overall posture.
The real sweat poured when they switched to cardio training and Floyd calmly did 100 push-ups and showed off his ninja skills with the jump rope.