It should be abdominal breathing. Is to breathe through the abdomen. The abdominal cavity collapses when breathing deeply, and bulges when breathing deeply.

First, expand vital capacity and improve cardiopulmonary function. It can expand the chest to the maximum extent, make the alveoli in the lower part of the lung expand and contract, let more oxygen enter the lungs, and improve the cardiopulmonary function.

Second, reduce the possibility of lung infection, especially pneumonia.

Third, it can improve the function of abdominal organs. It can improve the function of spleen and stomach, and is beneficial to soothing the liver and benefiting the gallbladder. Abdominal breathing can reduce blood pressure by reducing abdominal pressure, which is very beneficial to patients with hypertension.

Fourth, soothe the nerves and improve intelligence.