A few tricks after I had my lesson tonight. One thing my horse has a hard time with is the halt..he doesn't like to stop moving :) I can get him to nearly walk in place but asking him to actually stop moving is the same as asking him to jump the moon. My trainer/coach used this method and it helped though we are quite a way away from geting a nice halt where the horse isn/t bracing his neck.
Set the horse up three strides ahead of time by using the half halt...use the calf to apply leg pressure then squeeze with your hand, release, squeeze, release, squeeze and release. By the third squeeze/release sequence the horse should stop..if they don't, a much sharper pull to make them STOP, then immediately release. As for general position it remains ther same. Sit deep and stop following with the seat.
In my case the horse is being a nit...it isn't the he doesn't understand, he just has this constant go attitude which, as my trainer put it, means that occasionally I have to get mean about it and demand it rather than simply ask.