A football coach is a person who is willing to lay down your life for the good of his team.
"Success is largely a matter of stumbling forward. We fail forward to success. It's a case of falling forward and getting up whenever you fall down and beginning again. Failure is an inevitable, necessary and useful part of being successful. Actually, we learn more from failing than from succeeding because failure impresses us with what we did not do, and it impresses us more memorably than succeeding."