AETHERPHON, global theremin family

One thing I have noticed, and will have to work on, is that when I am 
really getting into it, my pitch arm (elbow) will go almost horizontal, 
so that my elbow is pointing to the right, and not at the ground. This 
causes me to cramp up pretty quick. Am I correct in saying that my 
elbow must be pointed towards Terra Firma????

Philip