Saw this and thought it was worth sharing. Taught to Sylvie by Karhuat essentially using your elbows to block and stop punches as well as framing, flowing into elbow strikes and back into your standard guard. Its particularly effective for bare knuckle fighting like kard cheuk and lethwei and is great for Muay Thai. I don't think this would be great for MMA as it involves leaving a lot of body exposed for a takedown, although Conor McGregor has a similar move in which he has one elbow up. It is very interesting to see though as this technique is something that is very much Muay Thai. While you see old school boxers do it, it's certainly not as common in boxing today as it was in the 60s. Thought I'd share so that you guys could give it a try. Also check out Karuhat, he's the man.