Ride a bike.
You know, I haven't ridden a bike in a very long time. Over ten years, in fact. Probably a little more than that. And the thing is, well, I'm a little worried I've forgotten how. (It was a change in bike that did it---stopped me riding, I mean. I was a little too small for the very big bike my parents bought me, new, from the shop in the village---and to this day I feel bad about it).
This year I want to do it again---I want to make sure I can do it, still. And if I can't? Well, I want to learn.