How are we supposed to Breathe?

To understand what nature intended, it is necessary and useful to understand how the diaphragm works. The diaphragm is the sheet-like band of muscle separating your chest from your abdomen. When the diaphragm relaxes and moves up into the chest cavity, the lungs contract and air is forced out. When the diaphragm expands, it moves down into the abdominal cavity, pressing on the lower organs. In the case where your automatic method of breathing is too shallow or incorrect, you can easily and consciously make changes that will affect the volume of air you inhale and exhale.