Only 5 high schoolers have done it so far, which shows how rare it is. I believe that American distance running is taking a turn for the better, and it's very possible that 3 or more boys can break 4 on saturday. If the number of HS sub 4s increases from 5 to 8 in just one race, I believe that it will be the beginning of the end for the "mystique" of the HS sub 4 mile