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Perhaps the simplest advice is to try to always breathe through the nose. Why? Because the nose functions to deliver air to the lungs in as perfect condition as possible. It makes over-breathing physically more difficult simply because of the smaller size of the nostrils compared with our large open mouth. It filters out most of the dust and particulates found in the atmosphere. It moisturizes the air when it's dry, as in centrally heated rooms, delivering air that doesn't irritate and dry out the delicate membranes of the lungs. It conserves water and helps reduce the risk of dehydration. It contains active organisms that trap and destroy many potential infective agents in the air we breathe, protecting the lungs from infection. It is also found to be responsible for the production of up to 50% of nitric oxide in our body when we breathe normally through our nose. Nitric oxide has many vital functions in the body that are still being discovered, we know nitric oxide can dilate blood vessels and improve circulation hence its use for treatment in angina. When people have not been habitually nose breathing for many years it may take a little time and perseverance to retrain the nose to do the work of breathing it was designed for. A Buteyko Conference I attended in Brisbane a marathon runner told, how with Buteyko Training she had learned to nose breathe throughout the entire marathon and this had improved her performance by doing so. Many Olympic athletes in Australia and New Zealand have undergone Buteyko Training to improve their sports performance, endurance, and recovery, so breath training is not just for anyone who is not well but also for those who want super fitness and endurance.