My Aikido teacher tells us all the time that our force generated at the core and the limbs (the head is there too) is always moving at the direction of our fingers both in the legs and the arms. I've noticed that it works well with my center balances as I visualize the planes of movement and adjustments I make as I learn.
I read Sonnon article "Threading Scorpion Bridge: a THP Progression" which made me think like all good things and employing tensegrity it makes sense that the direction of the extremities will cause a shift or wave that will help move the body through the scorpion bridge and maybe add more fun to it.
I use a more articulated version of the first body flow "exercise" from the book where I transfer the torque to the wrist and fingers before the energy returns and do so in the back bridge. I started from a static one hand on the floor and one back hand on the floor and played with the transition as I became comfortable and the stress disappeared from my lower back and shoulders. After that I started to use that small movement to generate a chain (original choice of words I know) that literally wooshed me through the scorpion bridge.
Thanks for the inspiration and the place to word it, Sharon.