The New York Times asks:

Too Cold To Exercise? Try Another Excuse!  The New York Times recently wrote an excellent article about exercising in the cold. If you’ve ever exercised in anything colder than 50 degrees, you may know exactly how tormenting it is. They are saying that as long as you keep moving, it is perfectly safe to workout in the cold. And with that being said, it might even make ya work a little harder instead of wimping out I know for me, I absolutely throw out every excuse in the world not to go running during the winter months. I’d usually get dramatic and layer on about 3 jackets, but according to the NYT, THAT’S what’s dangerous.“Some worry that cold air will injure their lungs or elicit asthma symptoms. Or they are convinced that they are more susceptible to injury when it is cold and that they have to move more slowly — forget about sprinting or running at a fast clip.But lungs are not damaged by cold, said Kenneth W. Rundell, the director of respiratory research and the human physiology laboratory at Marywood University in Scranton, Pa. No matter how cold the air is, by the time it reaches your lungs, it is body temperature, he explained.”  Sighhhh, I guess that means I should get my lazy bum up and start my marathon training–regardless of the weather. And I thought my “its too cold”  excuse was completely valid!