Don't let winter put a freeze on exercise

While "Old Man Winter" can't keep some enthusiasts from exercising outside, exercising outside in cold weather can be hazardous for asthma sufferers, according Dr. Abraham Sanders, a pulmonologist at the New York Weill Cornell Medical Center.

Sanders offers the following tips when exercising in winter:

"Winter already is a difficult time for asthmatics because of the increased incidence of the cold and flu, which can evolve into more serious conditions such as bronchitis or pneumonia. Adding exercise to the mix can mean even more trouble," Sanders said.