Routine physical activity (7)

I believe the answer is:

dancing

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'activity' is the definition.
(dancing is a kind of activity)

I can't explain the rest of the clue.

(Other definitions for dancing that I've seen before include "Taking a series of rhythmical steps and movements in time to music" , "Moving to music" , "Strictly Come - - (TV)" , "Performing ballet" , "Terpsichorean exercise" .)

I've seen this clue in The Mirror.

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