It was fortuitous: last week at our mutual friend I.'s talk, I saw graduate student H. and learned that she is teaching a class at the local gym I used to belong to. It is NIA, non-impact aerobics (dance-based, incorporating martial arts and other movements), and not at all the sort of thing I usually do, but I like to support people I know in their endeavors and I said I'd come to the Thursday 4:30 class. I was particularly glad of having made that commitment as it was a day of meetings, with work obligations before and after, and I am not sure I would have used the time particularly well if I had not actually said I'd be there to exercise!
1hr light aerobic exercise with good stretching benefits