Side reins are a type of rein used primarily when longeing a horse, running from the bit of the bridle to the saddle or surcingle. As a horse training tool, they encourage flexion and softness in the horse's mouth. For Longeing work with a rider up who does not carry ordinary riding , they help calm and settle the animal. However, they are a tool best used by experienced handlers; used improperly they may unduly restrict the horse's movement or cause an accident.
Side reins may be completely of solid material, or they may have an elastic or rubber ring insert. Each design has its advantages and disadvantages. Designs with elastic have more "give" to them, which is useful for sensitive horses or horses that throw their heads. Elastic inserts must be used with caution, however, as some horses learn to lean on them. Solid side reins are the older, classical design, give the horse a more solid contact to work into and discourage leaning, but must be adjusted with greater care because their lack of give may upset a sensitive horse and, particularly if too tight, may provoke rearing, headshaking and even panic in some animals. Side reins with a rubber donut provide some give, although not as much as elastic and so discourage leaning. However, they are heavier and are prone to bounce when the horse trots or canters, which does not provide as steady a contact as the solid or elastic-insert side reins.
Side reins are also used with in-hand showing.
Side reins are adjusted longer for less-experienced horses, and gradually shortened and raised higher (from point of shoulder up to the point of hip) as a horse becomes better trained. Side reins should never be so short that the horse's head is pulled behind the vertical. For green horses, the side reins should be adjusted so that the horse's head is approximately 4 inches in front of the vertical and the side reins are attached at a point level with the point of the shoulder.
As the horse becomes more advanced and more physically developed, the side reins may be shortened so the head is nearly vertical to the ground. Side reins should not pull the horse in—they do not create collection. Rather, a properly longed horse will collect himself, and the shorter side reins will be the correct length for him to keep a contact with the bit. Short side reins should not be used for long periods of time.
Side reins should usually be adjusted so they are the same length on each side, though in some cases, the inside rein may be slightly shorter, particularly with a horse that has previously been allowed to develop the habit of arcing its body away from the circle. It is considered correct to fasten the outside rein before the inside rein, similarly to the idea that a rider would take up outside contact before inside rein contact. It is best to make sure that both side reins are adjusted before attaching them to the bit, as it can be irritating to the horse to stand with one side rein attached while the handler is adjusting the other.
Improper adjustment of side reins can cause a horse to go behind the bit, spoil the horse's training, and even cause the horse to feel trapped, leading to rearing and the possibility that the horse will flip over.
Side reins should not be used for jumping, as they restrict the use of the neck too much, and may even cause the horse to fall.
Like the side rein, the lauffer rein is adjusted so that the horse has contact with it when his head is at or just in front of the vertical. Green horses should have the lauffer rein attached to a lower and middle surcingle rein, while more advanced horses can have the reins raised to a middle and high ring on the surcingle.
The sliding side rein was designed to be attached to the outside rings of the surcingle, not between the legs. Running the reins between the legs can encourage a horse to get behind the bit and overflex.
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