Crossword Genius

Do you need an exercise book to do so? (4,3)

Ross

I believe the answer is:

keep fit

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(Other definitions for keep fit that I've seen before include "Exercise designed for physical wellbeing" , "Maintain health" , "sort of exercise" , "Do physical exercises?" , "Callisthenics" .)

I've seen this clue in The Globe and Mail.
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