This can only be accomplished by vigorous exercise of the entire body which causes a rapid Suction and Pressure movement that causes the air to flow in and out of the lungs more rapidly and in greater quantities and gives to each little air chamber a full supply of oxygen and at the same time casts out all lurking carbon dioxide that poisons the system. Frequent deep breathing movements, therefore, are necessary for the preservation and power of the lungs. But this deep breathing must be forced upon the lungs by the muscles of the whole system and not by merely deep breathing exercises. Deep breathing that is not forced by muscular movement of the whole body may have a beneficial effect occasionally but if the muscles of the chest should be relied upon altogether for this purpose other muscles of the body would be thrown into disuse and become weakened. The length of man's life depends upon the weakest organ.
Longevity demands that all organs be kept strong.
The healthiest pair of lungs would be useless if the heart failed to work. The strongest heart would fail if the trachea would not function. Running, is one of the very best exercises to make all muscles of the body work and cause deep breathing. When man runs it forces the muscles of his feet, legs, hips, abdomen, back, shoulders, neck, head, arms and hands into general action that makes necessary combined power that requires the burning up of much internal fuel. The consumption of additional fuel means the demand for additional oxygen.