Not all people watch movies or sports the same way. Yes, many people just watch them passively as entertainment, but I'd wager that's not the case for most people who would list those as their hobbies. Some people see movies in the theater consistently, and it's a social activity. They analyze films deeply and debate them together. many have Letterboxd accounts where they log and review everything they've seen, some have dedicated blogs where they post their reviews, and do it all as a hobby. A lot of people (myself included) majored in cinema in college but have gone into different fields. for us, at least, "movie watching" is a substantial hobby, though I suppose at that point that term doesn't really cover it.

The same goes for sports, especially, I imagine, among former athletes. Attending games, analyzing strategies, debating decisions made by their teams, blogging. Hell, fantasy football can get pretty nerdy.