Agreed. Conventionally happy people don't push themselves to this kind of extreme. But its not just long distance endurance running of this extremity ... also

Agreed. Conventionally happy people don't push themselves to this kind of extreme. But its not just long distance endurance running of this extremity ... also highly driven entrepreneurs, or people in nearly any kind of career that requires sacrifice of body or time with family, etc. To sacrifice the part of you that is devoted to ordinary human life is to usually not value such ordinary human experience much to begin with. But our culture also makes heroes out of such sacrifice. Just enjoying a normal, family-oriented life is considered mediocrity in many (most?) circles.