Ring in chest is baffling physical jerks (13)

I believe the answer is:

callisthenics

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'ring in chest is baffling physical jerks' is the definition.
I can't judge whether this definition defines the answer.

'ring in chest is baffling' is the wordplay.
'ring' becomes 'call' (synonyms).
'baffling' indicates anagramming the letters.
'in'+'chest'+'is'='inchestis'
'inchestis' with letters rearranged gives 'isthenics'.
'call'+'isthenics'='CALLISTHENICS'

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(Other definitions for callisthenics that I've seen before include "Light exercises designed for general fitness" , "Light exercises for gracefulness, fitness and strength" , "Fitness training" , "Light exercises to promote general fitness" , "Exercises to develop muscle tone" .)

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

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