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I do no tonic. Doing exercises, so quite healthy (2,4,9)

Ross

I believe the answer is:

in good condition

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'quite healthy' is the definition.
I can't tell whether this defines the answer.

'i do no tonic doing exercises' is the wordplay.
'exercises' indicates anagramming the letters (letters exercise or move around).
'do'+'no'+'tonic'+'doing'='donotonicdoing'
'donotonicdoing' anagrammed gives 'ngoodcondition'.
'i'+'ngoodcondition'='IN GOOD CONDITION'

'so' is the link.

Can you help me to learn more?

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