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Each of these gives your head a proper workout: chess, crosswords, logic puzzles, coding side projects, learning a language, genealogy, electronics. There is more to learn than in most hobbies and they are slower to pay you back, so the first few weeks are study as much as play. Maybe not if what you want after work is something you can do with your brain switched off.
119 hobbies. Each has what it costs to start, how much time it takes and a first session to try.