Here's the Best Way to Boost Your Immune System

Some people seem to breeze through cold-and-flu season without so much as a sniffle. What’s their secret?

Regular exercise is a prime candidate. “If you look at all the lifestyle factors that decrease the number of days you suffer from common cold, being a physically active and fit person is the most important,” says David Nieman, a professor of public health and director of the Human Performance Lab at Appalachian State University.

Some people seem to breeze through cold-and-flu season without so much as a sniffle. What’s their secret? Regular exercise is a prime candidate. “If you look at all the lifestyle factors that decrease the number of days you suffer from common cold, being a physically active and fit person is the most important,” says David Nieman, a professor of public health and director of the Human Performance Lab at Appalachian State University.