1. Inhalation and exhalation in which the abdominal muscles perform the major part of the respiratory effort: Such abdominal breathing may be seen in various abnormal conditions, such as a cerebrovascular accident, a spinal cord injury, and coma.

Singers practice abdominal breathing so they can enhance their vocal performances.

2. The process of inhaling and exhaling is supplemented by abdominal wall muscles that compress the contents of the abdomen and indirectly raise the diaphragm; diaphragmatic breathing: This kind of deep breathing, or abdominal breathing, is shown by the expansion of the abdomen rather than the chest when breathing.

Abdominal breathing is generally considered a healthier and fuller way to ingest oxygen, and it is often used as a therapy for hyperventilation, anxiety disorders and stuttering.