I was also learning to dance. I was doing it because my ex-fiance liked to dance, but I didn't know how. I figured I could learn, and it would be a good way to meet new people. I stopped that one too around the same time, though it is lot less strenuous than basketball (at least since I was just learning to dance).
I like to read a lot, and play chess. I also spend a lot of time on this forum. These are all fairly low energy.