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The jumping position is a position used by equestrians when jumping over an obstacle. It usually involves what is known as the "forward seat" or "2 point" because the rider's legs provide two points over which the rider's weight is balanced on the horse. It was first developed by Captain Federico Caprilli. This involves the rider centered over his or her feet, with the stirrup leathers perpendicular to the ground. Continuing a line upwards from the stirrup leathers, the head and shoulders fall in front of the line, as do the knees, the hips fall behind it. A correct jumping seat serves two purposes: * It gives the horse the freedom to jump the obstacle, allowing it to keep the forelegs and hindlegs tight, thereby decreasing the chance of a rail down or a fall. It also encourages the horse to bascule over the fence, which improves jumping form and ability to jump higher obstacles. * It provides the rider the support needed to stay out of the horse's way while still maintaining a secure seat so that the horse is less likely to fall on landing. ==The influence of the horse on position== The jumping seat is ''not'' meant to be held by the rider, but rather it is a fluid seat that changes as the horse's balance changes. It keeps the rider in a position over the horse's center of gravity. It is important to note that the horse, not the rider, is responsible for opening and closing the rider's angles (notably, the hip and knee). As the horse takes off, it raises its upper body off the ground and comes closer to the rider. This makes the rider's hip angle (between the thigh and chest) close. Over the fence, the rider keeps the angles closed. As the horse lands, it moves away from the rider's body, which allows the hip angle to open and the rider to become more perpendicular to the ground. Also, if the horse takes a jump wrong in some manner, due to rider error or other, the rider may be thrown around a little bit and may sometimes get 'left behind', where the rider's center of balance is behind that of the horse's. This can also throw the horse off balance and lead to other problems such as knocking down a rail. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「jumping position」の詳細全文を読む スポンサード リンク
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