( ( When ( one ( practices Qigong ) ) ) ( , ( one ( ( must ( learn ( to ( regulate ( breathing ( to ( ( smooth ( the ( Qi flow ) ) ) ( in ( ( ( the ( large intestine ) ) and ) ( the lungs ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (PRP one)) (VP (VBZ practices) (NP (NNP Qigong))))) (, ,) (NP (PRP one)) (VP (MD must) (VP (VB learn) (S (VP (TO to) (VP (VB regulate) (S (VP (VBG breathing) (S (VP (TO to) (VP (VB smooth) (NP (DT the) (NNP Qi) (NN flow)) (PP (IN in) (NP (NP (DT the) (JJ large) (NN intestine)) (CC and) (NP (DT the) (NNS lungs)))))))))))))) (. .)))
When one practices Qigong, one must learn to regulate breathing to smooth the Qi flow in the large intestine and the lungs.
(ROOT (S (NP (JJ Smooth) (NN muscle)) (VP (VBZ regulates) (NP (NP (NN air) (NN flow)) (PP (IN in) (NP (NNS lungs))))) (. .)))
Smooth muscle regulates air flow in lungs.