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by potta_coffee 1399 days ago
Off the top of my head:

- Infantry Small Unit Leader or Officer: Involves tons of thinking about small unit tactics and logistics, planning missions, etc. My military experience was quite demanding mentally as well as physically.

- Martial Arts Instructor: I'm currently learning Brazilian Jiu Jitsu and it's both physically and mentally demanding. The strategy aspect can be quite deep. Adding the demands of teaching and instructing others brings in a whole other set of considerations. It takes a few years of training before you can start instructing other people and ~10 years of training before you can become a black belt which would enable you be an instructor in your own right.