Who’s the most improved runner you’ve ever seen from freshman to senior year of high school?

Rebel w/o clue wrote:

Jim Ryun is a good suggestion. He was above 5 in the mile and maybe screwing around with the wrong kids smoking cigarettes at the time or just getting over that phase. Sophomore year he was a different beast.

Ryun ran a 58 second 440 in 8th grade.

He started cross country in 10th grade with a 5:38 mile, but then ended that cross country season 6th at state.

He won the mile in track season with 4:16, beating the previous winner and runner ups, Charlie Harper and Gene McLain.

So, he didn't start at the bottom, though he certainly did improve quite a bit.

yaseen abdalla is one.