Kai not only means opening the four lims but the mind as well, he means closing the mind along with the four limbs. Perfection is achieved when one unifies the two and harmonizes the internal and external parts into a complete whole. But in taijiquan, the movement is blended with tranquility, and while performing the movements, one maintains tranquility of mind. It has a soothing effect on the body and the mind. Learners of taijiquan will get a better understanding of all this through careful study and persistant practice.
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