Yeah, nice try. The only time it is acceptable to "give a horse's mouth a good yank" is during a buck/spook etc to stop the horse from bucking or rearing or what not. To encourage the horse to do something, you use the LEG aids and your seat, not the rein aids. You will not get a horse to move forward by yanking his mouth around. Rein pressure=good. Yanking=bad. ANYBODY can yank on a horse's mouth. I see a lot of little kids yanking on their horses at shows. It takes no talent and shows impatience on the rider's part. Why would somebody pay to work with this Julie when they can learn yanking from a bad rider for free?
Kevin, I respect your opinion, but I have worked with horses like the mare that was on the show, but changing the bit, nor yanking on them was how I got them out of it; my appy, who is now ready to find a new home (project horse), was like that, and I gaurentee you, if I had put a harsher bit than a snaffle, OR slammed him to a stop he would have landed on top of me. Instead I started teaching him to just move his feet...it didn't matter that we were going in circles, but I was still getting what I wanted, and he was still learning he HAD to 'go forward' whether he wanted to or not; he was also staying calmer, and remaining in a thinking frame of mind, rather than a reactive state of mind...not only that but he is extremely soft in the bit now, and will bend and flex very nicely. I don't think a high calibar bit, or harsh hands is EVER the answer to 'waking a horse up'. If it works for the horses you train, cool, but I won't do it that way ;)