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No exertion. You’re not pressing against the pedals to push your weight up and back off the front of the bike, so you shouldn’t be pedalling hard.
Also, the expectation isn’t to be able to totally support your body weight with your core, just enough of it that most/all of your upper body weight isn’t being supported by your arms and wrists.
To add - This is what I’ve picked up from the bike fitting sessions I’ve had, but IANABF, so hopefully someone with real knowledge can comment.
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No exertion.
@scherrit will normally test this kind of thing at threshold. Or maybe that's just for me because I need to burn the extra calories :P
Out of interest, what exertion level do you need to pedal at in order to do this?