I'm another lucky one - I live in the southwest and the winter weather just hasn't been bad enough to stop me. I ride 5 days a week to work, weekends when I can, hike the mountains, run the dogs and lift weights for my upper body plus abs/back. I have never tried a spin class - it just hasn't been cold enough to force me to stop riding a real bike!
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"