Abdominal breathing techniques increase lung ventilation and improve cardiorespiratory function. Abdominal breathing is a basic form of breathing. Abdominal breathing increases the range of motion of the diaphragm, and the movement of the diaphragm directly affects the ventilation of the lungs. If abdominal breathing is used properly, it can help increase lung ventilation and can improve cardiopulmonary function. Lung ventilation mainly moves the diaphragm up and down. As the diaphragm automatically descends during inhalation, squeezing the organs to the lower part, the stomach will expand. When exhaling the diaphragm rises and the patient takes deep breaths, exhaling more carbon dioxide that tends to stagnate at the bottom of the lungs. It also maximizes the expansion of the chest, allowing the lower part of the lungs to expand and contract, allowing more oxygen to get inside the lungs, thus improving cardiopulmonary function. Abdominal breathing is not suitable for all people, it is recommended that if you want to carry out abdominal breathing need to be combined with their own situation, under the guidance of a doctor.