Behind the Vertical: FEI's Hyperflexion Rule Gap

The Fault Every Hunter Judge Already Knows

In a hunter ring, a horse that drops its head behind the vertical and stays there is faulted. USEF Hunter Division rule HU137 spells it out in plain language: a head carried behind the vertical, giving what the rulebook calls "the appearance of intimidation," counts against the horse for the entire trip. No committee studies it. No working group is convened to weigh in. A judge sees it, and the horse's card reflects it. It is one of the few places in the sport where a welfare judgment gets made in real time, out loud, without apology.

One discipline over, at the highest level the sport offers, a far more extreme version of that same posture is ridden into international warm-up rings every week, and the FEI still will not put a name to it in its own rulebook.

A Word the FEI Still Won't Write

The technique is known by several names: rollkur, hyperflexion, low-deep-and-round. All describe a horse's neck drawn in and down, chin toward chest, well past the vertical, sometimes held there for the length of a warm-up session. The FEI's own welfare subcommittee denounced the practice as a form of abuse back in 2008. Two years later, following a round-table conference in Aachen, the federation drew a line it has held to ever since: hyperflexion achieved through "aggressive force" was unacceptable, while the same head-and-neck posture reached gradually, without force, was renamed low-deep-and-round and allowed to stand.

That distinction has never made it into the FEI's actual rulebook. The word "hyperflexion" appears nowhere in the FEI Dressage Rules, the General Regulations, the Veterinary Regulations, or the online dressage judging manual. Stewards are told to watch for it in the warm-up arena. They are not given a rule that defines what they are watching for.

Poland has tried twice now to close that gap, proposing that hyperflexion be added to the list of abusive practices under General Regulations Article 142 — the same article that already defines "Abuse" as any action or omission that causes or is likely to cause a horse pain or unnecessary discomfort, and that applies across every FEI discipline, jumping included. Both times, the FEI has declined. Its stated position on the most recent proposal, for the 2026 rules revision: "The FEI does not support the proposal." The federation's reasoning is that current welfare working groups and studies should run their course before the rulebook changes again.

What Twenty Years of Data Actually Show

The FEI's request for patience would carry more weight if the research base were thin. It is not. A systematic review and meta-analysis published in Scientific Reports in October 2024 — led by Uta König von Borstel, chair of animal husbandry, behavior, and welfare at Justus Liebig University Giessen in Germany — pooled 58 peer-reviewed studies on dorsoventral neck hyperflexion in ridden horses. Of the studies that took a position on welfare outcomes, 75 percent reported concerns, a result the authors found statistically significant. The measures behind that figure have grown considerably more sensitive than what researchers had access to twenty years ago: eye temperature as a stress proxy, heart rate variability, conflict behavior scoring, and rein tension, in addition to the older standbys of heart rate and cortisol.

That last point matters, because the earlier science the FEI's caution is partly built on is itself dated. A frequently cited Utrecht University pilot study from 2006 found no difference in cortisol or glucose levels between horses ridden in a rollkur frame and horses ridden on a light rein — a result still invoked, two decades on, as evidence that hyperflexion causes no measurable stress. It was a study of eight horses, using two hormonal markers, before most of the current behavioral and biomechanical tools existed. Treating it as current science is no longer defensible; treating it as a reason to keep waiting is even less so.

The Case the FEI Already Won

The FEI does not lack for an example of its own making. In August 2025, the FEI Tribunal handed down a 15-year suspension against former Olympic dressage rider Cesar Parra — the longest ban in the sport's history — after an investigation built on 29 videos, 25 photographs, and four witness testimonies documenting what the tribunal called methodical, repeated abuse of horses in his care. Parra had been under provisional suspension since February 2024. The tribunal fined him 15,000 Swiss francs and ordered him to cover 10,000 francs in costs.

Hyperflexion appeared among the practices cited in that case. But in testimony, the FEI's own experts drew a careful distinction: hyperflexion on its own was not treated as the violation. It became abuse, in the tribunal's framing, only in combination with whips, spurs, and other forceful handling layered on top of it. The federation that has spent two decades saying a name alone does not prove abuse used that exact argument to win its most severe welfare case ever — and then turned around and told Poland the evidence for a rule was still insufficient.

The Steelman, and Why It Still Falls Short

There is a real argument underneath the FEI's caution, and it deserves to be taken seriously rather than waved off. A horse's neck moves through a wide range of positions during a single training session — a momentary stretch behind the vertical during a transition is not the same thing as a program built around sustained, forced hyperflexion, and a rule written carelessly could end up penalizing normal riding rather than the abuse it is meant to catch. Writing a workable, enforceable definition — one a steward can apply consistently across a warm-up ring full of horses moving at different tempos — is genuinely harder than writing a blanket ban.

But the FEI has already solved harder drafting problems than this one. Its own noseband gauge and its 2026 blood-rule overhaul both turned a subjective, judgment-call standard into something stewards could apply with a tool and a threshold. A rule requiring sustained duration, a defined angle past the vertical, and evidence of force is not a reach for a federation that regulates tack tightness to the millimeter elsewhere in the same rulebook. What is missing after two declined proposals is not the technical capacity to write the rule. It is the will to be held to one.

What This Means at Ringside

None of this requires a hunter or jumper rider to wait on Lausanne. The standard already exists, written in plainer language, one division over: a head held behind the vertical, consistently, is simply a fault, because it looks like what it is. Buyers watching a prospect in a foreign warm-up ring, or riders evaluating a trainer's methods before committing a horse to their program, do not need a federation's permission to apply the same test the hunter ring already trusts its judges to make on sight. The FEI's rulebook may still be silent on the word. The rest of the sport does not have to be.