Try incorporating family activities into your winter routine to make this your healthiest month yet; here are a few suggestions:

Sledding. Get your blood moving while climbing hills. You'll have so much fun you won't even remember you're exercising!
Winter walks. Take in the beauty of nature at your local park or hiking trail.
Preparing healthful meals. Shop for seasonal fruits and vegetables as a family, and see what healthful meals you can whip up.