I don't think that physical size has any bearing on your officiating quality. I'm not the thinnest person, but i can run up and down the court. I just get slow after 4 or 5 games
. As long as you're running up and down the court, and not looking like you're about to die, physical size shouldn't matter. Why would honigs make pants for someone with a 52" waist if physical size determines your ability to ref.