“Absolutely, you can improve and become better at toughness. It's a talent, but it can be acquired, too. I think of it like building a callus.”

American football coach and former quarterback

Jim Harbaugh is an American football coach and former quarterback. Born James Joseph Harbaugh, he has led the Los Angeles Chargers of the National Football League and has also coached at Michigan, the San Francisco 49ers, Stanford, and the University of San Diego. Harbaugh played college football at Michigan from 1983 to 1986, then spent 14 seasons in the NFL from 1987 to 2000. His longest run as a player was with the Chicago Bears, where he played from 1987 to 1993. He is known for a career that has moved between major college programs and the professional game.