I like picking things up and putting them down again. I refer to it that way because I'm not lifting heavy enough weights to be powerlifting and my primary aim is not hypertrophy, so it's not bodybuilding either.
I also like most other things relating to fitness: running, pull ups, press ups etc.
Other than that: hiking, photography, crosswords, logic puzzles, video games, building/fixing computers, and shopping - yes, it's a hobby!
Oh, and I'm attempting to learn German. It's not particularly difficult, but I keep missing weeks and then forgetting the things I already learned! I must try harder.