Call me crazy, but I write unit tests. There's something about the cycle of red -> green -> refactor that I find incredibly soothing (which is also one reason why I love TDD).
Also, if I've got an extended period of down time that I can't spend in the mountains, I learn new languages. I often don't use them after an initial period of learning (I've never written a line of Clojure that wasn't in my book!), but it fills my need to solve problems without the pressure of deadlines and such.
I enjoy writing tests and documentation. Most colleagues would call me crazy, but I just enjoy all parts of software development process (well, almost all; the only thing I hate is deployment without containers).
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