Ken, Ed & Ben smashed leg exercise (4-4)

I believe the answer is:

knee-bend

'leg exercise' is the definition.
(I've seen this in another clue)

'ken ed ben smashed' is the wordplay.
'smashed' indicates anagramming the letters.
'ken'+'ed'+'ben'='kenedben'
'kenedben' is an anagram of 'KNEE-BEND'.

I've seen this clue in the Sydney Morning Herald.

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