My senior year, the kid who was going to be the starting running back for the football team the next year according to the depth chart turned out to be a guy who ran the 600 in winter track and the 400 in spring track. Given how bad our football team was at that point that wasn't saying much.
My buddy had been the best distance runner in the school for 3 years at that point and so one week he ran the 600 and beat the running back by 2 seconds. The next week, I decided to run the 600. When I took off from the gun, the running back had a choice to make, either lay it all out there or lose by 5+ seconds to another what he though of as inferior distance runner.
He chose to lay it out. He ended up out leaning me, not that I had any idea of how to lean. He beat his time from the week before by more than 5 seconds. He ended up finishing 4th in the state after previously not even having run a qualifying time. He credited me with teaching him how to race.
Years later, he told my parents the story of what happened the next fall at football practice. That fall was the turning point of football at our school. That fall two freshman running backs went out for the team and changed the team from never glimpsing .500 to undefeated their last 3 years of HS, both going on to play for major college teams. However, before they started winning, they had to get through the running back I had taught how to race.
When he saw them, the senior new he was smaller, slower and was much less coordinated than either of them. He knew, by the end of the preseason, they would be the ones on the field not him. He decided that before that happened, he would teach them how to work. The football coach noticed all of his hard work during preseason and let him start the first game because he was a senior. After the first set of downs led to 3 and punt, he never played another meaningful down all season. When they signed their letters of intent, both running backs pointed to that senior running back as the person with the biggest impact on their HS careers. The running back told my parents it had really started in a winter track 600.