Here in Norway, we have four beautiful seasons. We are finishing one of the finest summers in modern time, and now the autumn is knocking heavily on our doors. Following the change of season also comes a colder weather, and shortened time of sunlight during the day. Importantly, also comes increased incidence of bad colds, fever and different airway infections. Some swear to vitamins, honey, and a number of other nutrients and experimental ways of avoiding these unpleasant, but usually mild and harmless diseases. However, have you taken your daily dose of exercise as medicine?