Stopping square in dressage tests?

My trainer always reminds us that the halt is a forward movement. So what I do is I sit down about five strides before where I am supposed to halt. I then half-halt two or three strides out from the halt. Squeeze with the thigh, push your horse into the bridle, aaaaand halt. It always sounds silly to me, pushing a horse into stopping, but trust me, it works. Darn near every time I ride my halts like that my horse stops square, or very close to it. I can even get my five year old OTTB, who has been in training for two months or so, to halt square.