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In 2000 and 2004 the Welshman Jon Brown placed 4th in the Olympic marathon. In 1992 the best British time was had by the Welshman Steve Brace. There are a grand total of three million people in Wales, so I think I can securely say this is no coincidence.
Now on the other hand as great as the Welsh are at running distance, they don't compare in that respect with Norwegians who have by a huge margin the strongest lungs in Europe, an Arctic adaptation. So it isn't purely strength, but rather strength interacting with something else.
I play rugby with a bunch of Welshman They do have amazing endurance but they also take extremely heavy hits, especially in the torso. Extremely strong diaphragm, ribcage and abdominals to back up the inbuilt athleticism
Insanely strong isometric strength in the abs and muscles supporting the ribcage, similar to something you mentioned about polynesians/islanders Another big rugby community all over the world
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