After coming back from Jossy Reynvoet I am paying a lot more attention to the side to side movement of the head. Especially in the Ground work and Longing.
It is very easy to block this movement with your hands. By blocking this movement you can interrupt the movement of the spine, what will have an influence on the whole body and its swung.
I start with following this movement to get the feel in my body, only after this I might be able to influence that movement if needed.
In this little video you can clearly see the side to side movement of the head.