Twice recently I have come down with cold symptoms after a longer or harder than usual run. I've barely got over the one I had a couple of week ago, now I seem to have another one. Yesterday I hammered the Stamina" podcast and had a sore throat with a few hours....I got one within 5 hours of doing my 10K two weeks ago, you'd have thought I wouldn't have been able to do that if I was incubating a cold. I normally get very few colds, this winter I've had three...Is it possible that extra exercise could leave body a little bit low and let a cold I would normally fight off get its foot in the door? Or is it just coincidence?