Brrr...its bone chilling outside today. Everytime I am going to the nearby market for some shopping, I break into a jog. Helps me to keep warm and stay fit till the time I am on holidays.
It seems like a good idea for people who are out working in this cold. First of all due to the cold no sweat, so no "mess", keeps body warm and keeps you running.
Try it when you are out next.