History
In the seventeenth century, Antoine de Pluvinel used the basic shoulder-in exercise to increase the horse's suppleness and to get the animal used to the aids, especially the leg aids. He felt the exercise helped to make the horse obedient. Independently, the Duke of Newcastle developed the exercise. In the eighteenth century, the French riding master Francois Robichon de la Gueriniere adapted the movement for use on straight lines.Performance
In the shoulder-in, the shoulder of the horse is brought to the inside, creating a 30-degree-angle with the rail, with the neck bent only the slightest amount, only softening in the jaw so that the corner of the eye is visible to the rider. The horse's hind legs track straight forward along the line of travel while the front legs move laterally, with the inside foreleg crossing in front of the outside foreleg and the inside hind hoof tracking into or beyond the hoofprint made by the outside foreleg. Because the horse is bending away from the direction of travel, the movement requires a certain amount of collection. The shoulder-in can be performed at any forward gait, but in dressage competition it is usually ridden only at the trot. A young horse is first introduced to the movement when coming out of a corner or a circle on which the horse is already correctly bent, from nose to tail, along the arc of the corner or circle, as it is usually easier to maintain bend than to establish it from a straight line in the young or green (untrained) horse. The rider is positioned on the horse in a manner similar to riding a circle or corner, with the shoulders aligned to mirror the angle of the horse's shoulders, while the rider's hips and legs mirror the position of the horse's hind legs. Thus, as the circle becomes the shoulder-in, the rider's shoulders are turned to the inside, while his/her hips remain "straight" on the track. The rider uses the inside leg at theReferences
Sources
* Richard Davison, ''Dressage Priority Points'', Howell Book House, New York 1995, * Jennie Loriston-Clarke, ''The Complete Guide to Dressage. How to Achieve Perfect Harmony between You and Your Horse. Principal Movements in Step-by-step Sequences. Demonstrated by a World Medallist''. Quarto Publishing plc London 1989, reprinted 1993, * ''Richtlinien für Reiten und Fahren. Bd. 2: Ausbildung für Fortgeschrittene.'' Ed. by the German Equestrian Federation (FNverlag) Warendorf 12th edition 1997, {{ISBN, 3-88542-283-2 Riding techniques and movements