I am convinced that running every day in the heat and cold or whatever the weather, you build up immunity to illness. I have not had the flu since I started streaking.
It was windy this afternoon, in the 30's and raining. I ran south on Veterans Parkway this afternoon. Frankly, I had to go to the restroom and there was no place. I turned around at one mile and headed back into the north wind, heavy rain and cold. Some lady stopped and offered me a ride. I told her I was out having fun. So, I got in 2 miles - and more immunity.