The diaphragm is a large muscle that sits below the lungs. It helps move air in and out of the lungs.
Normal breathing is relatively shallow and does not use the full capacity of the lungs. Diaphragmatic breathing is a deep breathing exercise that fully engages the diaphragm and increases the efficiency of the lungs.
This article outlines how diaphragmatic breathing works, how to perform it, and the potential health benefits and risks of doing so.