Comment by misja111

Yes I had to think of that article as well. It was on HN a while ago: https://news.ycombinator.com/item?id=10711731

The 40% rule is useful if you're in combat and your life is on the line. But then again, in such a situation the adrenaline would make you ignore any pain or fatigue anyway. In normal life this 40% rule seems just stupid.