Heartlessly fries chooks and reinvigorates (8)

I believe the answer is:

freshens

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'reinvigorates' is the definition.
The definition and answer can be both related to bodily activities as well as being verbs in their -s form.
Maybe you can see a link between them that I don't see?

'heartlessly fries chooks' is the wordplay.
'heartlessly' means to remove the middle letters.
'chooks' becomes 'hens' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'fries' with its middle removed is 'fres'.
'fres'+'hens'='FRESHENS'

'and' acts as a link.

Can you help me to learn more?

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

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