Bit worried I am not putting it across very well, and it sounds silly or boring instead of inspirational, but here is a little more ...
A lady was having trouble doing gates ... like you would in a Le Trec type comp, and her mare was rushing too much. Mark asked her to have a go, so he could see what was going on. Lady rode up to the gate, mare didnt quite end up in the right place, so rider sat quietly for a bit, then tried to reposition, same again, and on it went .... eventually she finally managed to get through.
Mark's opinion was that she was breaking a simple thing down into too many sections, and when the mare was in the wrong position, the rider spent too long sitting thinking about how to deal with what had gone wrong, the mare was not receiving any instructions, so had completely switched off, and by then, the rider was so busy thinking about one move, she had completely lost focus of what she wanted to achieve!
Mark said just picture riding up to the gate opening it riding through and closing it. I have typed that without comas because that was how he described it .... a simple flowing movement.
She sorted her head out ..... and did it beautifully!
I will try and remember some more and get back to you later, if you are interested.