My son just blurted that out today at lunch. Not sure where it came from or why. He is 8 years old. I just laughed and said that I was pretty good (pat myself on the back), but to be a champion, that implies that you have won something.
Then I said. The only thing I have won as a runner is a bit of confidence. Some self esteem. Stronger muscles. Physical endurance.
On second thought, son, you are right. I am a champion runner.