An infielder that doesn't stop his charge to the groundball even when thinking he can not reach it. The hitter than run at full speed when hit a groundball for double play. The outfielder that doesn't stop running after the ball, even thinking the flyball is foul. There are a lot of examples of hustle. As a coach I like the kid that was pitching and ask me for one more batter when I was going to call to the bullpen. Or the kid that thinking I was going to pinch hit for him got close to me and told me, "coach, I am going to win this game".