The idea here is simple. Compare the best times for this year's top 250 seniors to their best times as freshmen (at least those who recorded official times as freshmen here in Colorado).
While several of these athletes started out their high school careers as highly accomplished athletes, a large number of these individuals did not. Accordingly, as you look through the list, you'll find some rather dramatic improvements from freshman to senior year. There is some augmented variability from case to case, though, as the relationship between best opportunities as a freshman and as a senior is not a constant between runners.
We'll check in on this year's senior girls tomorrow.
Time Drop Freshman to Senior Year, 5K Cross Country