How do you develop a horse's scope through training?

Developing a horse's scope — its ability to clear larger fences — through training is possible but operates within the limits that the horse's natural physical ability defines: training can develop the horse's technique, athleticism, and use of its body to the full extent of its natural capability, but cannot create scope beyond what the horse's physical structure and natural jumping ability allow. The training approaches that most effectively develop scope work toward maximizing the horse's use of its natural ability rather than trying to produce ability the horse does not have. Gymnastic exercises — particularly bounce work and one-stride gymnastics that develop the horse's rapid hindquarter push, front end tuck, and back use — develop the technical qualities that allow the horse to jump more effectively at any given height, which effectively increases the height at which the horse can jump comfortably even though the underlying physical scope has not changed. Progressive height increases that consistently ask the horse to jump at heights that require genuine effort without exceeding its comfortable range develop the horse's experience of jumping near its scope limit in a controlled, confidence-building context rather than confronting large heights suddenly and unpreparedly. Correct flatwork development that produces genuine hindquarter engagement and a quality, powerful canter provides the physical foundation from which the takeoff stride generates maximum power — a horse that takes off with genuine hindquarter push from an active, engaged canter will jump higher and more easily than the same horse taking off from a flat, disengaged canter. The specific training claim that scope can be developed is most accurate as a statement that many horses jump significantly below their natural scope ceiling when their technique, fitness, or training is inadequate, and that correct training can bring their competitive jumping closer to their natural capability.