What is the genetic potential for an average American male to run a 5K in, at whatever his peak running age is?
Using whatever training would optimally train him for a 5K, what could he run a 5K in?
Another way to put this is if every American male spent his life training to run his fastest possible 5K at the prime of his life, what would the median (50th percentile) time be?
Assume optimal weight, diet, training. Take into account that mileage and training will be limited by genetics (i.e. some runners can't handle more than 30 miles/week without injury).
Basically I'm wondering what the genetic potential is for an average American male for 5K. What about marathon?