I have found this differentiation increasingly useful in standing practice.
In practice this morning I again found myself 'leaning back and lifting the front' and where before I would have become interested in the 'how' or 'why', this morning, I more simply understood this as the mobiliser system trying to do the work of the stabilisers and it was easy just to take the attention away and to refocus on listening for what the bones are 'telling me'.
I do some stick practice / play a few times a week and since my first live class I had been focusing on the area of contact that Sifu Kelley pointed out in the session.
Just exploratory play such as 'how much thumb pad am i using?', 'how does the heel of the hand contact feel', 'what is going on with upper cavities and bones' . I can't claim to have any clear understanding of 'cavities' yet, so I am just observing and not making any effort to 'achieve' anything.
After a couple of weeks of this I picked up my stick one morning and the connection immediately felt different. The practice felt 'snappier' as if the contact was more direct and the stick more responsive. And it wasn't just on strikes, even spiral/circular deflections felt more taught. The change felt disapportionate to the practice involved, a big return compared to time invested.