How do you fix a horse that gets flat over fences?

A horse that gets flat over fences — jumping with a straight or inverted back rather than the rounded bascule that correct jumping technique produces — is showing either a physical limitation, a confidence issue, or a training pattern that has not developed the athletic bascule through appropriate gymnastic work. Flatness over fences is one of the most commonly addressed technical problems in hunter jumper training because the hunter judge specifically evaluates the quality of the bascule and a flat jumping horse scores significantly lower than one that rounds over the fence. Physical causes of flatness include back soreness that prevents the horse from rounding through the spine during the jumping arc, and saddle fit problems that restrict the horse's back movement — both of which require non-training responses. Confidence causes of flatness appear when the horse is jumping cautiously or defensively — a horse that is not fully committed to the fence or that is managing a fence it does not trust will often jump flat because it is protecting itself rather than using its full athletic arc. Building confidence through appropriate height and many positive repetitions often improves the bascule without any specific technical intervention. Training causes of flatness are addressed primarily through gymnastics that specifically demand more athletic effort: wider oxers that require genuine scope across the width; gymnastic bounce exercises that develop the rapid front end tuck; and raising the fence heights to a point where the horse must use its body fully to clear the fence, which typically produces more athletic jumping than a fence well within the horse's comfortable range. Placing poles set before the fence at specific distances to ensure the horse meets the fence on a forward distance also helps, because horses that chip to tight distances often jump flat from the compromised takeoff position.