Look into the future wrote:
How many of these kids did anything beyond high school? College? A lot of them seemed to flame out.
Most high school athletes by far don't compete in their sport after graduating. Go to the Senior Night football game at your old high school and nearly every kid you see walking onto the field with their parents will be done after the season. My class must have had 15-20 football players. As far as I could find out one was recruited and went to what would become a Patriot League. I once went to their website to see if he had ever played there and found no indication he had. A guy who was a good friend as well as good running back and track sprinter went off to what would become a D2 school. He was on both the football and track teams as a freshman and quit the next year because in his words, "it was getting in the way of my drinking."
I was on our school's track team for four years. I don't know what happened with anyone after I graduated, but I know that I was one of three guys from out 1967 to 1970 teams who went on to run in college and the only one to last four years. I can't tell you why more of them didn't keep on but I will absolutely tell you it wasn't because our training burnt them out because we really never did any. I don't doubt that there were high school kids who left the sport because they were sick of continuous but if you look at high school athletes from any sport and in any era you'll see that far more of them leave the sport.