In this video, I'm using intent to internally turn my spine. From my internal intent and connection to uke through the wrist grab, uke feels the effects and is displaced either left or right, depending on if I'm turning clockwise or counterclockwise. I try not to move physically as this is an intent driven exercise.
Why "turn the spine"? Back in the old days and in all the old lore, everyone just turned their dantien/hara. Has that gone out of fashion, then?