@DoctorAKriegerin r/trackandfield • Recommends
On “I feel sorry for the future World Record holders”
Here's a video of Andre DeGrasse replicating the physical conditions that Jesse Owens had in 1936 and running almost a second slower.
link to this video
And a TED Talk that covers how much technological improvements have contributed to faster times vs the athletes just "being better".
https://www.ted.com/talks/david_epstein_are_athletes_really_getting_faster_better_stronger/transcript
Physical conditions matter a lot. Also there was no exogeneous steroids in Jesse's era either. Other things existed that would cause them to piss hot in a modern drug test, but none as effective as steroids.