Did you watch the Ten? 2 college guys ran faster than any of the million college guys had previously run. I have been coaching HS for a very long time. I have guys do workouts in trainers but they all try get away with using road supershoes. When I get guys to wear real trainers, the times that they race in their spikes is not close to what my previous athletes raced in old spikes. Our school record was broken last year at 9:05. The workouts matched up with guys who raced about 9:20 ten years ago. It seems that I am the only one here who has control data.