There is a very simple way to inhale and exhale. I've been using it. When I am angry, I inhale slowly through my nostrils and exhale slowly with my mouth open. When I am not angry, I slowly inhale through my nostrils and exhale through my nostrils. Every time I focus on my navel, that is, my abdomen. When inhaling, close your eyes and slowly flow into your abdomen, feeling that the purest air in the sky is sucked into your body. My body is rising infinitely, I can't breathe any more, and then slowly. Completely relaxed, no distractions. Don't hold your breath. Everything should be natural. After practicing for a week, your hands and feet will feel hot if you exhale again. This is the simplest way to exhale and it is also very effective. It can adjust the balance of yin and yang and strengthen your physique.