The Mayo Clinic is one of the leading medical institutions in the world and they publish a web site "tools for healthiere lives". Today's postings include an article on winter training tips to stay motivated and safe in the cold.
The article includes links to other exercise related posts inluding one about when it is safe to continue exercising if you are sick - another timely post in the winter. IT essentially says that symptoms "above the neck" such as sore throat, runny nose etc. are OK and you can continue training - when the symptoms hit the rest of your body it is time to take a rest.
Other winter exercise posts:
Winter Exercise Clothing
Winter Exercise Tips for Asthmatics
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