Trot
Many people find trotting jarring and uncomfortable. The trot is a two–beat gait with the two diagonal feet of the horse striking the ground at the same time. But it is not this impact that causes the jarring many riders experience. A rough trot is generally caused less by the horse and more by the rider. The imapct the rider feels is the impact that occurs when his seat, which has risen from the saddle, comes in contact with the saddle again.
A rider who does not follow his horse's action goes up when his horse goes up, but does not go down immediately when his horse goes down. Instead, he lets the momentum of his rising body continue to lift it until gravity takes over. As gravity takes effect, the rider starts to descend. By then, the horse has already begun to rise again. This causes a collision as the two bodies meet.
Many people become nervous when a horse begins to trot. They squeeze with their legs to hold on to the horse and pull on the reins in an effort to keep the horse from going too fast. These actions on the part of the rider cause the horse to become tense. When a horse becomes tense, his motions are not as smooth.

The rising trot (posting) was developed to make the trot more comfortable. Many riders, however, transform the rising trot into deep knee bends, exerting much more effort than necessary. At the same time, they often loose their balance and plop back into the saddle causing the horse to stiffen his back muscles to absorb the shock. The stiffer the horse, the rougher the trot.
A rider who lets the horse's movement do the lifting and concentrates on using his abdominal muscles to drive his body forward posts much more smoothly. He can also use this forward motion to control the horse's speed and stride. Normally, a little more effort in this forward motion causes a little more forward motion on the part of the horse.
For many people, a good sitting trot can prove more of a challenge than a posting trot. Beginners can limit the jarring effect of the trot by lightening their seat and taking more weight in the stirrups while, at the same time, using their legs as shock absorbers.
More experienced riders still allow their legs to flex during the sitting trot, but keep more of their weight in the saddle, sitting deep as they allow their body to follow the horse's motion. They go up as their horse goes up and anticipate and follow the downward motion of the horse rather than waiting for gravity to pull their body downward. This technique allows a rider to use his seat as one of his methods for directing the horse's movement. Without sitting deep in the saddle, the rider cannot perform a proper half halt used, among other purposes, to collect the horse.
A properly collected horse rounds his back rather than making it hollow. This difference in the shape of the horse makes a spectacular difference in the quality as well as the comfort of the trot.
Proper trotting can only be achieved through much practice. Proper instruction in the trot can only be done through observing the rider and correcting faults as they occur. As in all riding, a proper trot begins with a proper seat, balance, and relaxation.
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