Running up and down stairs or bouncing in place for a few minutes will get your heart going and make the cold more bearable when you do venture outside. If you live in a snowy climate, there's nothing better than cross-country skiing to burn a lot of calories in a little time. Snowshoeing and winter hiking are also challenging sports and can seem more like an adventure than a workout. Don't forget your summer workout essentials - sunscreen, chapstick and sunglasses. Above all, don't give up! If you just can't handle the cold, then find an indoor workout that you enjoy. Exploring the fitness DVD section of the video store could yield a new and exciting exercise opportunity!