I never believed in driving my horses around to wear them out to stand still.
I do believe in the premise that "I have until midnight - how long you choose to take, is up to you.
I will walk the horse in a circle; not the same as driving the horse, even though the principle is the same.
It is not good for a Walking Horse to be driven in tight circles - their shoulders are built for large sweeping movements.
I like that phrase "shotgun trained" - sums things up nicely - two of my three TWH's were like that when I bought them. However, I have always ridden bareback so they needed to learn to stand stock still no matter what ungodly place I decided to plant them so I could get back on
One took longer than the other one because "the other one" still asks "why!?" to most things and he's been with me nearly 18 years.
The third TWH was most likely also a mover when the previous owners rescued him but, they worked and worked to rehab him and I'm sure standing still was part of the rehab.
This is the TWH that took me the longest to teach to stand still. He had not seen a bridle in three years, when this pic was taken. His legs and head were thinking about moving but he understands what "NAH!" means, so love him, he never moved. He is not mentally capable of just standing there without thinking something he should not be thinking
At any rate, circle the horse long enough, don't let it put its head down for grass, it will get pretty bored and decide to stand still. It may take awhile but patience prevails