I have the honor of training under a professional Muay Thai boxer here in the US. He is here from Thailand to coach and lead classes at my gym and he does an amazing job.  He is an awesome coach but does not speak a word of English. Despite this, he communicates very well through body language, demonstration, and very minimal English. He has a hilariously goofy yet extremely disciplined personality which is common among Thai boxers.    Occasionally I will say things in Thai that I get fro