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Another non-team sport that has good problem solving aspects but on a faster pace is trail running. You don't get the same thinking through a route you might have with rock climbing, but leaping over rocks and ruts requires some quick subconscious analysis and careful pacing that can be quite exhilarating.

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That sounds like it is very high engagement and requires presence. I get something similar riding a bike in traffic, which is logically stupid but experientially great.

You could do orienteering, then you get the mental aspect also. It is really fun and you get the forest running.

Seconded. I did quite a lot of orienteering as a child and enjoyed it a lot.

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