HOW TO BREATHE
Air should enter the lungs through the nose instead of through the mouth. Even when running, if possible, keep the mouth closed. Fewer impurities will pass into the lungs by so doing, and in cold weather the air is slightly warmed before reaching them, making one less likely to “take cold.” Sometimes, as in running, the heart heats so rapidly that the lungs can not keep up with it and supply air enough for the blood; then we are “out of breath.”

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