Nothing, really. If I had other hobbies, I wouldn't have time to ride, hike, do core work, x country ski, snow shoe.
I read, but I don't really see that as a hobby.
Same thing with cooking. I love to cook and I do different stuff every week. But, I don't see it as a hobby, same way as I don't see reading as a hobby.
I am not good with anything crafty, handwork, etc.

Go to the theatre 7 times a year.
If I can't do my physical activity, my day feels very empty and I am "bored." That's when I read.... just realized I used to fill up a lot of time with shopping, but with the advent of the Internet, I almost never go to stores to buy clothes.