Chess with the human body

Keenan Cornelius is a world class blackbelt in jiujitsu. His skill level is sufficiently high that he can verbalize his tactics in real time as he rolls with lower belts.

"He's trying to bump me off mount, so I'm shifting my weight to my left knee to keep my weight off of his hips. But once he gives me an opening I'm going to slide under his lapel to finalize the choke..." Sometimes he is several moves ahead of his opponent!

Roy Dean does something similar, but with narration added in post-production, here. Roy's video is more precise (for one thing, he's not out of breath) but what Keenan is doing is super impressive :-)