[statguy]

I was curious so I looked it up, it turns out that the men’s world record for a mile is 3 minutes and 43 seconds, the women’s is 4 minutes and 7 seconds. These are the very best in the world at their prime. I would conjecture that less than 50% of adults in an industrial society would be able to run a 7 min mile, which is less than twice the world record times.

[stavros]

> Less than 50% of adults

That's a fancy way of saying "around 5%".