Strive to be the very best you can be. Run the race against yourself and not the guy in the other lane. The reason I say that is, as long as you give it 110% you are going to succeed. But as long as you're trying to beat the guy over there, you are worried about him; you're not worrying about how you've got to perform.
I never get tired of running. The ball ain't that heavy.
When I started out as a little kid, I didn't say 'I just want to run football.' I wanted to be a great athlete.