I've started lifting weights in earnest.
Once you get past the second workout (always the worst), it's very fulfilling. For one, you get to flex your biceps and actually see something. For another, a slight change overcomes your body: you have a curiously distinct sense that you're stronger. This is pretty empowering.
One set of exercises I've been doing works the pocket of muscles below your shoulder as well as your triceps. Those muscles have started developing, and they feel like wings: a hidden mass of wings coiled beneath my shoulder blades. It's my hidden superpower. I could take part in Clash of the Titans.