If you are exercising outside during these freezing cold days of January here are a few tips to help you :
Dress in Layers : Start with a thin layer of synthetic material such as polypropylene, which wicks sweat from your body. Stay away from cotton because it holds the moisture and will keep you wet. An outer, breathable layer of nylon or Gore-Tex will help protect you against wind and precipitation, while still letting out heat and moisture to prevent overheating and chilling. If it's really cold out, you'll need a middle layer, such as polar fleece, for added insulation.
Avoid Overdressing : You're going to warm up once you get moving, so you should feel a little bit chilly when you start your run. A good rule of thumb: Dress as if it's warmer outside than it really is.
Don't Forget Your Head : About 40% of your body heat is lost through your head. Wearing a hat will help prevent heat loss, so your circulatory system will have more heat to distribute to the rest of the body. When it's really cold, wear a face mask or a scarf over your mouth to warm the air you breathe and protect your face.