You can't always tell what kind of terrain is underneath snow cover. As a result, if you're not careful to keep your eyes peeled on the road ahead as you walk or jog, you may be surprised by a pothole or slick patch of ice.

Lateral stability on snow, slush, and ice presents a real opportunity for injury; you can easily twist an ankle or turn your knee in an attempt to stay upright. High snowdrifts and unplowed streets require an extra effort, too, especially from your buttocks and thigh muscles. Take shorter, quicker strides than normal and hold your arms slightly away from your body to improve your balance. Whenever possible, travel along well-worn paths where the snow cover is minimal and you can see what's coming up.

Let someone know where you're going and the approximate amount of time you'll be gone. Stick to familiar territory and, whenever possible, follow a route that has several safe havens like a corner deli, gas station, or friend's house. A course that loops in a circle is often safer than running to a turn-around and then back again. Loops invariably have you heading toward home.

On extremely cold days, head for the gym and pound the treadmill rather than the pavement or perhaps get in a little cross-training by doing some other type of cardio exercise.