My horse came from Iceland. Standing still and waiting was something he could not and would not do. He had other issues too. So, after being terrified one time too many, I took him right back to the beginning and trained him all the things I wanted him to know as if he were new to it all. And now, he knows that I give him a small bit of carrot before I clamber elegantly on (ie, when I am tightening his girth), and then he gets "the other half" after I have plumbed in my exploding gilet thing. Then he is allowed to move off but never before his second carrot piece. He knows this. I will literally get off and eat his 2nd carrot in front of him if he as much as twitches if I haven't done the gilet clip up onto my saddle! He stands like a rock.