It can be anything, from finishing something with a minimum amount of resources, broken code that somehow works or pure exploration and guessing e.g. phreaking or just finding a random telephone number that gives you goodies.
or, most especially life itself. No point of all work if no play.
I am sure many on here are playing with the same "outside of programming" type ideas.
I've been a budding woodworker for the longest time and even though I keep going back to playing with some kind of tech thing outside my day job, I have been teaching myself how to draw faces (Loomis method), and trying to pick up woodworking again. Each of these require enough time but they're a welcome departure from the usual tech stuff (which I still generally enjoy but has been very intense, working on Pandemic-response projects)
Dang deletes posts just for saying something simple like "yes" -- b/c apparently an upvote is supposed to serve that purpose.
but i suppose such rules are selectively enforced (and probably entails some bias, such as political view, etc.)