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Physical activity, but it can be bookish (8)

Ross

I believe the answer is:

exercise

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'physical activity' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for exercise that I've seen before include "Physical activity done for health and fitness" , "Gym activity?" , "Task set to practise" , "Practice session" , "Exertion to develop fitness" .)

I've seen this clue in the Evening Standard.
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