I didn't realize what a calming effect my Chianna Bear had on me until we lost her October 1. When I walked her it was just so relaxed and she was such a calm easy dog. I noticed my anxiety increasing after she was gone. Cyric is a higher maintenance dog so our walks aren't as relaxed since he is very dog reactive, but cuddling with him at home and just petting him is so relaxing. I sometimes feel like I'm melting.
Hiking is still exercise but a huge stress buster for me.
I also find crochet relaxing. I haven't colored (kids' coloring books, I do not want detail for an already cluttered overworking brain!) or made jewelry in a long time but those things are also calming.
But my biggest stress reliever is baking and making candy. Yes, there are times a recipe might not be turning out right, but for the most part nothing bothers me when I'm in my kitchen (except Cyric barking at reflections or the neighbors' dog...argh!).