running martingales are good for schooling assistance, but if used wrong you can really damage your horse. I've known people to use them and have made very negative impacts on the animal. I'd suggest teaching your horse to get down on the bit yourself, or use draw reins with a trainer's help. Martingales shouldn't be used to get your horse into a frame. They are merely a guide. They arch the horses neck and pull on their back, it can be frustrating and cause the horse to lock their jaw and resist the command. Hope this helps :)
Count My Strides - Shane, Bought 2-18-06, Mustang.
"I whispered to my horse, "i'm afraid of falling" and he whispered back, "i have wings".