“…DB has a potential to be a non-pharmacological treatment for patients with stress disorder as well as chronic respiratory disease. Although a number of studies have investigated the efficacy of breathing exercises in treating chronic obstructive pulmonary disease (COPD) [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ], asthma [ 30 , 31 , 32 , 33 , 34 , 35 ], postoperative pulmonary function [ 36 , 37 , 38 , 39 , 40 ], and cardiorespiratory performance in post-Fontan patients [ 41 ], the effect of DB on other disorders, for example, cancer, heart failure, and anxiety, still needs to be further investigated. As a martial arts practitioner, the author uses DB in daily mind–body exercises ( Figure 1 ) and feels the necessity to assess whether DB has a favorable impact on the overall health.…”