The average American adult suffers from two to four colds a year, which add up to approximately 1 billion colds per year in the United States. The latest study showed that exercise cuts the risk of having a cold by 50 percent, and cuts the severity of symptoms by 31 percent among those who did catch a cold. The researchers noted that each round of exercise may lead to a boost in circulating immune system cells that could help ward off a cold virus.[1]
Exercise regularly to ward off colds. Increase frequency and length of exercise during the flu season.
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Dr. Kim
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[1]http://abcnews.go.com/Health/ColdandFlu/exercise-stave-off-colds-infections/story?id=12135405