Metaphysics of War and Meditation on the Peaks can be summarized as combat/mountain climbing are a rite of passage for the proper development of men. The importance of combat is quite obvious, mountain climbing (or other) is about the Faustian experience of pushing yourself in activity where you may die, just as in combat. Other activities that overlap might be other climbing (rock, tree, etc.), scuba diving, a bushcraft expedition, white water rafting, etc.

There's actually a Duke of Edinborough award that kind of revolves around the sort of preparation that is necessary for a mountain climb or other expedition.

https://www.dukeofed.org/our-program/participate/how-the-award-works/

Think of a noble character trait and an activity that best allows you to practice that trait.