Another way of saying this is that (thanks to the actions of the Inner Spiral) the ‘scooping’ of the tailbone with
the Outer Spiral
should not
result in
‘tucking the pelvis’ or ‘tucking the tailbone.’
The whole language of
‘tucking’ is an older way of speaking that, while it was meant to communicate extension, has the practical effect
of creating a gripping in the hips and pelvis that works against that extension