I have been doing a fair bit of road running recently, and until this weather kicked in (cold) I could run about 6-7 miles quite comfortably. However in the cold air I seem to really struggle for breath, is there anything to do with cold air affecting breathing ?
Last month i was running in the 'fog' early in the morning. It had a slight tinge to it... then I realized it was actually a dust storm. So yeh, dust storms are bad for your lungs too. :nono
So is there any benefits from running in the cold other than you feel the benefits more in the summer ?