I personally feel that our ancestors persistence hunted, whilst some had more abundant food available without this hunting. It was geography and resources.
But the problem now with long distant running today such as the marathon, people are running against the clock, to get their PB, at a pace higher than maybe they should be, hence chronic cardio. The ultra runners are probably running at a pace more in line with Grok's long distance speed, but this sport is too fringe.
Give them nothing! But, take from them everything!