spinning is a great way to keep fit. I hope you at least try winter cycling. It's exhilarating and fantastic. You just have to dress appropriately.

As for me, I will continue with Pilates, yoga, and tai-chi. I will also ride my bike as much as possible--my goal is 3x/week even if it's just around the neighborhood (but I fully expect to do plenty of longer cold-weather rides), and spinning.