Chinese exercise system (3,3)
I believe the answer is:
tai chi
'chinese exercise system' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tai chi that I've seen before include "'Chinese form of slow physical exercise (3,3)'" , "'Chinese meditation involving slow physical exercise (3,3)'" , "Chinese system of slow exercise for relaxation, balance and health" , "Chinese martial art and system of callisthenics" , "Chinese exercises" .)