5k is not a middle distance. It's a long one.
I've heard that East Africans are so good at long distances because they tend to have what is known as a slow twitch muscle structure while people of West African descent make the best sprinters because they have fast twitch muscles. That seems to be true when you consider who wins the sprints and who wins the marathons.
I don't know how that works for white people.
TT is a former big guy who probably has the natural body structure of a big guy. Running for miles is probably a major struggle for him.
In high school I ran the 400 and the 400, 800 and mile relays. I could maintain full speed for
100 to 200 meters and was able to force myself to finish well at 400 but even then when I was in the best shape of my life I couldn't run even 1 mile without slowing down to a walk to finish.
It's probably all in the genetics.
@KyleK posted one time that he had run something like 40 miles without stopping. Are white people from western European ancestry naturally faster over short distances than people from Eastern European ancestry? I don't know. The last white man to win the 100 meters in the Olympics was Valery Borzov, a Russian. Americans have done well in the marathons up until ,more recently being outrun by Kenyans and Ethiopians. Bill Rodgers and Alberto Salazar were two great American marathons about the same time in the 70's and 80's. Rodgers was born in Connecticut and is the quintessential white man, while Salazar was born in Cuba and was a naturalized American.
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