Dave Leduc is the Open Weight Lethwei world champion.  If you don't know what Lethwei is google it - its an amazing combat sport. A lot of people assume fighters are mostly 'knuckle draggers'.  While some are, most are highly intelligent, they're like chess players, except instead of using pieces on a board, they use real people!  Dave is one of those highly intelligent fighters, you're going to enjoy this candid talk. 

Learn more about him here: https://en.wikipedia.org/wiki/Dave_Leduc