Men's 100: 14 times 9.75 and under from 2007-2015, 0 times from 2016-

improved drug testing. obviously. they even have shoes with springs and they still aren't as fast.

What is even more surprising is that meanwhile the 200 guys look faster than ever. I was wondering why. Seems hard for the top gyus today to go under 9.90 while we see some 19.50 like it's nothing.

Hurdles times have been fast too. It’s probably a combination of improved testing and just a lack of major talent. The sprint outliers are Lyles who can’t start, and Norman/WVN/Gardiner who are 200/400 runners . Otherwise you have converted long jumpers and 400m runners winning the last two titles. Perhaps Assinga and Tebogo get the event back down to the 9.7s.

Could also be some of the stars capable of it hitting hurdles. Like Bromell with injuries, Coleman getting suspended, Lyles never developing a start, Knighton focusing on the 200, Micah Williams getting injured, Jaylon Slade getting hurt, Schwartz and Tyreek Hill prioritizing football. Plus maybe with no star like Bolt anymore, maybe people are okay with hitting 9.8 or just barely making it into 9.7 territory since that's all they need to win. We have an insane number of people who have run sub 10. 37 athletes this year. There has never been depth like that before.

a genetic trait will become common only if its benefit outweighs the cost. 9.75 or faster uses too much metabolic energy to build/repair the necessary body structure, so it is now dying out.

The gene pool is still experimenting with 19.xx 200 runners. But we have to admit, none of this is going to help us outrun any animal, so in the end it will be eliminated.