The horse definitely knows what it's suppose to be doing, but it's CLEARLY visible the horse is NOT happy about it.
I can tell at two points that the horse rears up and comes forward teeth bared and striking out before she cues him to, she just makes it look like she cued him by reacting fast.
You can tell that he understands what he's suppose to do while he's licking at the point where he's running around on the rail.
My mind/common sense (what little I have lol)/gut tells me that the only reason the horse can do that is because he's so aggressive towards his "handler". She's repeatedly hitting either his legs/chest/face with the whip and he's coming after her..on his hind legs because the whip is forcing him to stay up.
If the horse was trained superbly and wanted to do such a "trick", he would've came down and walked calmly out of the little arena..which he did not..his handler ran backwards not paying any attention to her surroundings other than the horse at multiple points of the video. Posted via Mobile Device