Accounting for 45% the air volume during inhalation, your diaphragm is your most crucial and most efficient muscle for breathing.
Diaphragm is a dome shaped muscle sitting at the base of your lungs separating your chest cavity from your abdominal cavity.
Collapsed posture, lack of exercise, incorrect breathing patterns and disease such as chronic obstructive pulmonary disease (COPD) interfere with efficient operation of the diaphragm. The aging process which essentially means the long-term continuation of the same condition weakens the diaphragm like any other muscle that is not used.
When diaphragm is not working well, one or both of tow conditions happen. The first is shallow breathing and the second is upper chest breathing. The first reduces the life-giving oxygen to your body and the second increases the effort required to inhale which is tiring and eventually ends up with shallow breathing.
Diaphragmatic breathing techniques are a necessary part of functional training exercises as well as explosive sports performance motions. A steady flow of increased oxygen resulting from proficiency in diaphragmatic breathing could have a calming effect on your nervous system. The increased oxygen also improves stamina and help burn the fat storage.