If the chi is dispersed, then it is not stored (accumulated) and is easy to scatter. Let the chi penetrate the spine and the inhalation and exhalation be smooth and unimpeded throughout the entire body. The inhalation closes and gathers, the exhalation opens and discharges. Because the inhalation can naturally raise and also uproot the opponent, the exhalation can naturally sink down and also discharge (fa fang) him. This is by means of the i (mind), not the li (strength) mobilizing the chi (breath).
Red.: from Five Character Secret (Calm, Agility, Breath – to gather the chi, The internal force – the complete chin, Spirit – Shen concentrated).
Reference: T’Ai Chi Ch’Uan Ta Wen, Questions and Answers on T’Ai Chi Boxing Chen Wei-Ming ( Benjamin Pang Jeng Lo & Robert W. Smith ) North Atlantic Books 1985