The Ordinary Greatness of Roger Bannister
newyorker.com
newyorker.com
https://www.ted.com/talks/david_epstein_are_athletes_really_...
The speaker notes that Bannister ran his mile on a cinder track and claims it degrades performance by 1.5% compared to a modern synthetic track.
Cinder tracks do look like they would be quite soft.
https://www.youtube.com/watch?v=2NGgiMDHjKM
This site claims that British cinder tracks were mostly crushed brick rubble. They required heavily spiked shoes.
https://theolympians.co/2015/07/01/the-last-of-the-cinder-tr...
Let alone compared to the rubberized-surface of a (what used to be) high-level track. Even the local Redmond high school track is miles better than the best I ran on in the 80s.
As for what the "cinders" were made of, I'm pretty sure ours was made from literal cinders. The output of coal-fired power plants, IIRC. It wasn't brick rubble, that's for sure.
Amateurism in sports is a complex subject, but in many ways has its roots planted in classism. Its similar to how unpaid internships nowadays can reinforce a class divide in certain fields -- those with family support or independent wealth are able to take unpaid internships while those that need the money can't afford to take those opportunities. In similar ways, requiring athletes to be amateurs didn't mean that amateur athletes didn't devote a lot of time to training, it meant that those that couldn't afford to spend their time training while unpaid couldn't compete.
Late 19th century definitions of amateur went even further than that: It restricted "amateurs" to those who had never profited for physical labor. That meant if you worked as a bricklayer and trained unpaid on the side, you were ineligible to compete.
https://en.wikipedia.org/wiki/Four-minute_mile#Possible_othe...
Probably none of the previous cases is sufficiently well documented to be recognised on its own, but there are several cases that are 90% certain, or thereabouts, so probably at least one of the previous cases - there are more of them than the three mentioned in the Wikipedia article - did involve someone running a mile in four minutes. There's a whole book on the subject, I think, but I can't remember the title.
https://www.bbc.co.uk/news/magazine-27298505 https://www.theactivetimes.com/does-first-four-minute-mile-p...
I can't find the book I was thinking of. I don't think it was "Running: A Global History", but perhaps it was.
(I though this stuff might be interesting for some people. Am I breaking some rule by mentioning it in this context?)