June 20, 2017 Randy Brown Mantis Boxing, Training Tips Training Your Elbows and Joint Locks (Chin Na) June 20, 2017 Randy Brown Mantis Boxing, Training Tips Joint locks (Chin Na) are fun!!! If you are into pain that is. ;-) Seriously, standing submissions are very cool; unfortunately, they can be extremely difficult to pull off for real. Here is a more advanced drill to help you train ways to...