I used to love to untangle chains when I was a child. I had thin, busy fingers, and I never gave up. Perhaps there was a psychiatric component to my concentration but like much of my psychic damage, this worked to everyone's advantage.
I've always been really active. I grew up playing sports, so I'm always shooting hoops or throwing the football with my friends. I'm super-active in that sense.
I think I'm in better shape now than I was 10 years ago, but it takes a bigger toll - I get back pain!