Simply walking outside in the freezing weather without layers of warm clothing can intensify older joint problems and cause a great deal of pain. As muscles and blood vessels contract to conserve the body's heat, the blood supply to extremities is reduced. This lowers the functional capacity of many muscles, particularly among the physically unfit. Preparation for an outdoor winter activity, including conditioning the areas of the body that are most vulnerable, can help avoid injury and costly health care bills.

The American Chiropractic Association suggest that you start with some light aerobic activity (jogging, biking, fast walking) for about 7-10 minutes. Then follow these tips to help you fight back the winter weather:

• Skiing - do 10 to 15 squats. Stand with your legs shoulder width apart, knees aligned over your feet. Slowly lower your buttocks as you bend your knees over your feet. Stand up straight again.
• Skating - do several lunges. Take a moderately advanced step with one foot. Let your back knee come down to the floor while keeping your shoulders in position over your hips. Repeat the process with your other foot.
• Sledding/tobogganing - do knee-to-chest stretches to fight compression injuries caused by repetitive bouncing over the snow. Either sitting or lying on your back, pull your knees to your chest and hold for up to 30 seconds.
• Don't forget cool-down stretching for all of these sports - At the bottom of the sledding hill, for instance, before trudging back up, do some more knees-to-chest stretches, or repetitive squatting movements to restore flexibility.