Diaphragmatic breathing, abdominal breathing, belly breathing or deep breathing is breathing that is done by contracting the diaphragm, a muscle located horizontally between the chest cavity and stomach cavity. Air enters the lungs and the belly expands during this type of breathing.
This deep breathing is marked by expansion of the abdomen rather than the chest when breathing.
How it is done
To breathe diaphragmatically, or with the diaphragm, one must draw air into the lungs in a way which will expand the stomach and not the chest. It is best to perform these breaths as long, slow intakes of air – allowing the body to absorb all of the inhaled oxygen while simultaneously relaxing the breather.