Side reins
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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
Side reins used on an equestrian vaulting horse
A set of side reins with elastic, buckle adjustment
An 1860s image of a horse in side reins
The sliding side rein. These are adjusted with the side reins attaching between the legs.
Surcingle
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A surcingle is a strap made of leather or leather-like synthetic materials such as nylon or neoprene, sometimes with elastic, that fastens around the horse's girth.
Side reins
…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 longe line work with a rider up who does not carry ordinary…
A show Friesian horse wearing a surcingle
Detail of a training surcingle or "roller"