Stomach routine (5,5)

I believe the answer is:

belly dance

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'stomach routine' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?

'stomach routine' is the wordplay.
'stomach' becomes 'belly' (synonyms).
'routine' becomes 'dance' (I am not sure about this - if you are sure you should believe this answer much more).
'belly'+'dance'='BELLY-DANCE'

Can you help me to learn more?

(Other definitions for belly dance that I've seen before include "Entertaining manipulation of middle" , "Shaky performance" , "Exciting performance" , "Sensuous performance of Middle Eastern origin" .)

I've seen this clue in The Daily Express.

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