If it's cross-country ski season, I'll be out doing that, or snowshoeing up in Quebec. In my California home, I go to the local Y and I like doing yoga. It's been hugely beneficial to me in injury avoidance.
It was actually drumming that gave me the stamina to get into sports later. I started playing drums at 13, and when I got to the international touring level... I got interested in cross-country skiing, long-distance swimming, bicycling... things that require stamina, not finesse.