True; as people begin to lecture and /or discuss things they are passionate about, they tend to not only raise their voice and enlighten their facial expressions, but rather, they also cannot seem to stand still. Think of it as a preacher giving his sermon; once he gets going, he won't stay in one place.
I empathize with a fellow teammate, and the outcome was Positive. I shared with him that our coach loves us so much and he knows the sport so much more than us. Since he knows the game so well, He makes you do the things you may thing is not right. However, it actually is the right thing to do.