I’d say anything creative, something which pushes the mind to focus on generating new ideas instead of just running through the same old ones - this worked for me, at least, as rumination and catastrophising have been stapled to my noggin my entire life.

To be more specific, painting, building stuff with Legos, drawing, writing poetry, composing songs, whittling, woodworking, stuff like that.

Another important aspect (at least from personal experience, ymmv) is keeping the hobby a hobby - what I mean by this is not falling into the trap of perfectionism or productivity with it, keeping it light and fun. I now strongly believe that the brain needs something “inconsequential” on which to chew if only to remind it that not every stimulus it receives is do-or-die.

Hope you enjoy, Guts is part of Haunted, the one which caused the furor!

Chuck Palahniuk’s Haunted is the first thing which popped into my head.

It’s a ‘diegetic’ anthology, the context is reminiscent of Sartre’s No Exit in many ways, but taken to Palahniuk’s particular style of extreme.

There’s one short story in it which caused furor back in the day, but I honestly found the meta-context to be even more philosophically gruesome.

Edit: may be biased, I got the book as a gift from a girl I used to like a lot, but she… well, let’s just say she was living that book at the time.

Daily. Sometimes twice.

Anecdotally untrue, I clean my house regularly and masturbate daily.