Do you know that feeling? You step out of the house in the morning, greeted by thick fog; a cold wind chills you to the bone as it ‘sneaks’ under your coat; and on the tram or in the office, you can already hear the first coughs coming from all around. Autumn and winter have their undeniable charm – warm jumpers, evenings under a blanket and a crackling fire. But for our bodies, this is a period of a real ordeal. Most of us only start thinking about our immunity when we feel the first tickle in our throat and our tissues are disappearing at lightning speed. The truth is, however, that a strong immune system isn’t built by putting out fires, but through small, everyday habits . You don’t need to turn your whole life upside down. All you need to do is adopt these 5 simple rituals , which will naturally strengthen your body and prepare it for the chilly days ahead. 1. Ventilate briefly but thoroughly When it’s freezing outside, our natural instinct is to seal up