One reason I believe is they do not have the travel schedule of the other three major sports. Having less of an affect on thrir immune systems
Random Things Most NFL Fans Don't Know: Football Players Almost Never Get Sickhttps://bleacherreport.com/articles/1859740-random-things-most-nfl-fans-never-knew-football-players-almost-never-get-sick …
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Could be legit, but I think he's over looking a LOT of factors contribute to them not getting sick, most of which have to do with their social circumstances and not their occupation/sport itself.
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When I have a light to moderate cold, I actually feel the best while I'm at the gym.
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Be as active as possible!
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