I feel like this example only reinforces the point parent is trying to make. Having watched the clip below, it seems like running for eight hours in the heat of the day with no guarantee of a meal at the end is a dangerously foolish way to live.

The wasted time, energy and risk of injury or death pale in comparison to the sheer logistical problems if you do manage to make a kill. How does one exhausted hunter transport 300-400kg of meat without refrigeration back to his family 8 hours' run away?

Looks like more of an extreme sport than a reliable method of finding food.

There are still bushmen in Africa who live by this. It's entirely possible to make this work. There was a BBC documentary on this (it's on youtube somewhere). They hunt in teams of 3-4, with one designated runner. Once they find their prey, the runner is the only one who actually does the long persistent run. The others follow at a slower pace.