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Exercises performed when one doesn't want to go to bed? (3-3)

Ross

I believe the answer is:

sit-ups

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

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(Other definitions for sit-ups that I've seen before include "Gym exercises" , "Tummy tighteners" , "Physical training exercises" .)

I've seen this clue in the Evening Standard.
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