Tai Chi. Definitely not aerobic, hardly about strength, but definitely about balance and agility. I have been taking the class on M and W since September. Never thought to put it in my log till now. It's worth a note, at least.
I started because I felt it would do me some good. My balance isn't what it used to be nor am I as agile. When I was a grad student in Ann Arbor, I used to see a group of old Asian people doing it on a plaza as I rode my bike to my office most days. I stopped occasionally to watch. I thought it was beautiful but not something I wanted to put time into then. "When I get old", I decided. Well, now I am old and now is the time. I love the class. Plus it is a short walk from home and is free. I love the motions, the concentration required, the development of new motor patterns, the control it requires to move through the poses. I think it is good for my mind as well as my body. Like a dance--a slow, beautiful, meaningful dance.