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| Diagonals |
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Movements that test the coordination of the rider's posting and up-down motion with the diagonal movement of the horse's legs while trotting.
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| Disobedience |
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A term that covers several types of misbehavior, including deviating from the course, a refusal, run-out, and resistance.
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| Dressage |
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A type of competition in which judges award points for the performance of the horse and rider in a series of movements testing the rider's control and the horse's training.
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