I presume failing this test the remedy would be some core strengthening work?
More Steve Hogg for you ;-)
Specifically, 'Point of balance'
https://www.stevehoggbikefitting.com/bikefit/2011/05/seat-set-back-for-road-bikes/
That's the one; I forgot about the saddle setback thing though.
Sportive photos are a great resource in self diagnosis of bad bike fits.
@dubtap started
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More Steve Hogg for you ;-)
Specifically, 'Point of balance'
https://www.stevehoggbikefitting.com/bikefit/2011/05/seat-set-back-for-road-bikes/