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Stripping off, stay and pick this exercise form (3,3)

Ross

I believe the answer is:

tai chi

'exercise form' is the definition.
(type of exercise)

I cannot understand how the rest of the clue works.

(Other definitions for tai chi that I've seen before include "form of self-defence" , "'Chinese meditation involving slow physical exercise (3,3)'" , "Chinese system of slow exercise for relaxation, balance and health" , "Chinese system of self-defence" , "Chinese exercises" .)

I've seen this clue in The Independent.
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