Yesterday the temperature got stuck in the single digits and I spent most of it indoors. Today, with the warm front bringing it into the teens, I went for a walk with the wifey, then did a workout with Jake with the shed doors wide open to the beautiful sun. It makes me feel rugged and good when I workout in the cold. Why? I don't know. Obviously it doesn't put me on a higher moral plane than your average couch potato. But that's all you can do in life: find what makes you feel good and stick to it.