How do you teach your horse to square halt and how do you know without looking that he did it properly?

To square halt you should have your legs well balanced and go straight, with a good tempo, let your horse you'll stop with your back, and when you're stopping, keep your legs that your horse is going to keep his propulsion
I think you should close your eyes and training, again and again! When you're stopped, close your eyes and try to guess which leg is where :)
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