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Chi Sau is the most important part of the system. Chi Sau is not a form of kata. Chi Sau is not a form of sparring. Chi Sau is the bridge between techniques from the forms and real fighting. The forms are always the same. Chi Sau is free development. Every session is different.
However, the real purpose of chi sau becomes apparent in the more advanced stages, when the practitioners have learned to perform the exercise while extending chi into their limbs. While developing proficiency with the chi skills within the chi sau exercise one notices that their is an inherent sticky nature to chi.