How do you develop and maintain the extended trot required in Hunter Under Saddle?

The extended trot in Hunter Under Saddle is called for to evaluate the horse's ability to lengthen its stride and demonstrate additional scope beyond its working trot. When done correctly, the extended trot shows a horse reaching forward with its front legs and driving forward with its hind legs to cover significantly more ground per stride without simply moving faster with the same footfall pattern. Developing the extended trot begins with establishing a correct, balanced working trot that has genuine energy from behind. A horse that is not pushing from its hindquarters at the working trot has nothing to draw on when asked to extend, and the resulting movement will look flat and hurried rather than scopey and ground-covering. Trot poles set at extended distances are useful for teaching the horse to reach and lengthen its stride mechanically before the rider asks for the same quality under saddle. The rider asks for the extension with an increase in driving leg aid while maintaining a following, allowing hand that does not restrict the horse's neck or back. Horses that are held with a tight rein while being pushed forward from the leg will not extend correctly because the hand prevents the energy from traveling through the topline into a longer stride. The extension should be sustainable for a full long side of the arena — a horse that extends brilliantly for three strides and then falls apart has not developed the strength and balance to produce a correct, competitive extended trot. Building that sustainability requires conditioning the horse over time through consistent trot work and transitions.