As a watcher of the Seattle Mariners (for years), I had the pleasure of watching Beltre play 3rd base. Great athlete. I believe he has a very high pain threshold. Just watch the way he gets dirt out of his cleats. Most players tap their shoes a bit. Beltre whacks his foot. Then, picks up the other foot and whacks that one. He is a strong man.
He is a beast on third, playing very well right now. Hitting over .300. Had a walk off last night to win.