How often do you change directions? He has to slow down to change. If he speeds up again, keep changing his direction until he walks.
Stopping or speeding up can work, but which you do depends on the horse and its breed. Hot blooded horses like Arabs and TBs, ones with go, speeding up doesn't work. They are bred for their endurance. Those need to be stopped instead.
Cold blooded or lazy horses, you would want to speed up
Basically, do the opposite of what they want to do.
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