Yes, baby, it's cold outside, but that doesn't mean you should hide indoors (or under the covers) all season. Venture outside with ample layers and walk, jog, run, or skip to stay toasty and keep your heart rate up. Hike to a gorgeous lookout spot. Put on your parka, pack a healthy picnic, and head out to the very end of the beach. Show off your skills ice skating. Canoodling for extra body heat while engaging on an outdoor adventure is just a bonus.