What is Expelling the Stale and Inhaling the Fresh 吐故纳新?
Paul PengTu Na (Respiration), an ancient Taoist health-preserving technique. "Tu Na" refers to exhaling the stale qi from the chest through the mouth and then slowly inhaling fresh qi through the nose. *Zhuangzi·Ke Yi* states: "Blowing, breathing in and out, exhaling the stale and inhaling the fresh." That is to say, expel the stale qi and inhale the fresh qi. *Yunji Qiqian* holds that one can achieve immortality by absorbing vital qi and expelling dead qi.
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