Tip of the day: Layer up for a cold-weather workout

In winter, exercise clothes should keep you warm but allow sweat to escape. Dressing in layers allows you to shed clothing as needed. For underwear and socks, fabrics that wick away perspiration are best. Follow that with a middle layer of wool or lightweight synthetic fleece, and top it off with wind- and water-resistant outerwear made of nylon or a breathable synthetic like Gore-Tex. Avoid cotton, which retains sweat and loses its insulating power. Wear a stocking cap and gloves or mittens for protection.

Read more ways to get fit for the new year, and for the tips, tests, and Ratings to help you shape up in 2009, see our new do-it-yourself guide.