People who exercise frequently, as well as those who rate themselves as physically fit, are less susceptible to upper-respiratory infections. A study by Appalachian State University suggests those who work out five days a week suffered 43 percent fewer days with respiratory infections than those who exercise just one day a week.
Even when fit people got sick, their symptoms were less severe than those of non exercisers.
Your best defense against a cold or flu might be found in the gym.
