Fishing has been great for me. Gives ya a chance to learn what's around you by researching local waterways and what fish live in em. Then connect with them by studying their habits throughout the year and their diet. You plan your tackle box and rod set up around that and test your studies by trying to catch the dang things. And in the process of that you get some lovely, peaceful scenery and maybe a hike.

It's fairly cheap, too. The fishing gear on Ali Express is damn good for the price and while I can see arguments on spending on a quality rod and reel, I'll tell ya I prefer my $65 Pflueger President spinning reel, but I wouldn't have paid that much if I had used the $12 one I got on Ali Express first. You'll be replacing line, lures and hooks somewhat often when you start anyway so no reason to break the bank.

In the winter months, I do more model building and painting indoors. Gunpla don't have to be expensive and you can go all out on learning new techniques to erase mold lines and seamlessly join parts and that kinda technique learning keeps me engaged. Plus, when you're done, you have something you can put on display. I also give completed kits away to younger relatives when I get tired of it or I wanna try the kit again with new techniques.

As far as fitness, it's not quite a hobby, but I hop on a stationary bike and watch star trek. I fucking love Star Trek!