I can't tell you how many examples of kids running great times at 8 ,9or 10 for example, or even kids like 14 that are running good times, never make it past 16 or 17. Why is that? One great example of this was the Garrson kids that ran super fast times as pre teenagers, but never ran a step past 14. The older boy and girl actually ran times that would have got them on a good D1 team, but they never ran a step past their 14th birthday. I must be the odd exception because l started running at 10 and ran all the way through college and beyond with great success and never gave it up and at 51 l am still am running great times, but all my college and high school team mates are fat or gave up running many years ago. I only know of one guy who still runs out of all my high school and college teammates. Why do so many give it up?