I really like rock climbing. It's the only sport that I'm (kinda) good at, and the only one I actually like doing. If you haven't tried it, you should :3
Also Ninja Warrior (which, in my opinion, should be a sport).
When I was in school I loved basketball. Ended up being really good at it too....until I had a bad accident involving somebody else's head. It was such a hard head butt as we both went for the ball on the floor and her head was under mine. So when she went to stand up she bashed into mine. Literally passed out, ended up with a bad concussion. Kind of put me off since I never played it with as much enthusiasm since:
When I started working in a school I used to enjoy the beginning of term as it was always dodgeball for several weeks. Which I loved. Was so much fun with the kids.