This changes over time.

When I was a kid and teenager, it was mixed martial arts. I spent 12 years doing increasingly competitive mixed martial arts, became a second-degree black belt in my particular federation of schools, and became an assistant instructor as my first job. I watch some UFC with my husband because it's the only sport I understand at a pretty deep level.

I was also into trading card games, mainly Magic the Gathering. And still am, but it comes and goes in waves.

Although I haven't played any in two years due to work overload, video games have been a lifelong hobby of mine. From Nintendo and Playstation, to Starcraft, to Overwatch, etc. I've been so busy in the past 2-3 years because the macro environment has been absolutely crazy, and diving into the bitcoin rabbit hole has been another full time job. My work has therefore also been my hobby, at least for this period of time. All in.

Watching movies or shows with my husband, and discussing/debating with him about their content and execution.

Learning in general is a hobby of mine. I went through a phase where I read every major religious text, and a phase where I went through all the major world philosophies. I like to understand how people think in terms of what their highest ideals and frameworks are, and how they differ, and what their commonalities are. Back when internet forums were more of a thing, I was an admin on a religion/philosophy forum.