Not much.
Reverse abdominal breathing, as opposed to smooth abdominal breathing, focuses on making the abdominal muscles gently contract, constrict, or dimple as the body inhales. The breathing method of slowly relaxing the abdominal wall muscles and rumbling the abdominal wall again during exhalation is a special type of abdominal breathing, through which one can exercise the human respiratory function.
Counter-abdominal breathing can inhale relatively more oxygen, improve the body’s oxygen utilization rate, can be used for bronchitis, chronic obstructive pulmonary emphysema and other chronic respiratory diseases adjuvant therapy. Counter-abdominal breathing exercises human respiratory function, which can further enhance the function of the lungs and strengthen the heart function.
There is also no harm for those who need to train in reverse abdominal breathing to do so correctly under the guidance of a doctor.