Before revision: In qigong, reverse breathing is a breathing technique which consists of contracting the abdomin and expanding the thoracic cage while breathing in through the nose and then gently compressing it while exhaling through the mouth, which is the opposite of what an abdomen would do during natural, diaphragmic instinctive breathing.
After revision: In qigong, reverse breathing is a breathing technique which consists of contracting the abdomen and expanding the thoracic cage while breathing in through the nose and then gently compressing it while exhaling through the mouth, which is the opposite of what an abdomen would do during natural, diaphragmic instinctive breathing.