I hike (on snowshoes) and xc ski in the winter. I've never been consistent about indoor exercise, so I really need to get outside. But the hiking and skiing are never as consistent as the bike commute and mostly limited to weekends. I do have a ski/hiking trail in conservation land that leaves from my back door, so I can take a spin on the skis before work if the snow is good. Otherwise it's driving to the mountain on weekends.