Vertical flexion describes the horse’s posture when the head and neck are carried in alignment with the vertical plane, with the face approaching or at the vertical line. The poll — the joint at the very top of the neck — remains the highest point, the jaw is soft and relaxed, and the horse works in a rounded, through outline. It is a central concept in dressage and classical equitation, where the quality and consistency of the horse’s contact and outline are fundamental to progression through the levels.
What Vertical Flexion Actually Means
The term is sometimes used interchangeably with “on the bit” or “in an outline,” but vertical flexion specifically describes the angular position of the head. A horse in correct vertical flexion has its face perpendicular to the ground or within a few degrees behind it, depending on the degree of collection. The poll is elevated, the neck arches naturally out of the shoulder, and the back and hindquarters are engaged, carrying weight rather than pushing.
This is contrasted with a horse that is “in front of the vertical” — face tilted forward, often indicating a lack of contact or engagement — or one that is “behind the vertical,” where the face is tucked toward the chest in a way that breaks the line of communication between rider and horse. Behind the vertical is considered incorrect at all levels of dressage competition, as it removes the horse from the rein contact and creates a false, mechanical outline rather than a genuine one.
Achieving Vertical Flexion: What It Requires
True vertical flexion is not achieved by pulling the horse’s head into position with the reins. It is the result of the horse working correctly from behind — with active, engaged hindquarters driving energy forward through a swinging back, over a relaxed topline, and into a soft, consistent contact with the bit. When this chain works correctly, the horse naturally seeks the contact and softens at the poll, creating the vertical outline.
The classical progression follows the scales of training: rhythm first, then relaxation (Losgelassenheit), contact, impulsion, straightness, and finally collection. Vertical flexion in the truest sense emerges at the collection stage, though a working outline that approaches the vertical is expected much earlier. Attempting to force collection before the foundational elements are established creates tension and resistance that makes proper vertical flexion impossible.
Vertical Flexion vs Hyperflexion
An important distinction must be made between correct vertical flexion and hyperflexion (also known as Rollkur), where the horse’s neck is bent so aggressively forward and down that the face is far behind the vertical and the poll is no longer the highest point. Hyperflexion is controversial in dressage, with the FEI issuing guidance against its use in warm-up arenas. Studies have linked the technique to physical discomfort, obstructed breathing, and psychological stress in horses. The FEI permits a low, deep, and round outline for short periods as a training tool but explicitly prohibits the extreme, forced hyperflexed position.
Correct vertical flexion, by contrast, involves a willing, relaxed horse that seeks and maintains the contact through its own engagement — not one held in position by force.
Practical Application in Training
For a horse learning to work in a correct outline, exercises that encourage forward movement and relaxation are more productive than direct attempts to set the head. Transitions — within a pace and between paces — engage the hindquarters and encourage the horse to step under its body mass, which naturally lightens the forehand and elevates the poll. Leg-yield and shoulder-fore help create straightness and engagement simultaneously.
Lateral flexion exercises, particularly asking for a brief bend to each side at halt or walk, help establish softness at the poll and jaw before asking for vertical flexion at trot or canter. A horse that is stiff or resistant to lateral softening will rarely achieve genuine vertical flexion under pace.
Frequently Asked Questions
Is it wrong for a horse to be slightly in front of the vertical?
At lower levels of training, working slightly in front of the vertical is preferable to working behind it. Young horses and novices are trained to seek forward into the contact, which naturally keeps the nose slightly ahead of the vertical. As collection develops, the outline becomes more upright. A slight softening in front of the vertical at working paces is acceptable; consistent behind the vertical is not, as it indicates the horse is avoiding the contact rather than seeking it.
How do I know if my horse is genuinely flexed vertically or just overbent?
The key test is throughness: does energy flow from the hindquarters, through the back, through the neck, and into the rein? A genuinely flexed horse swings through the back, the hindlegs track up or cover well, and there is an elastic feel in the rein contact. An overbent horse typically has a stiff, tense back, shows little activity behind, and may feel heavy in the hand or dead in the contact. Have an experienced trainer assess from the ground — visual evaluation of the back swing and hindleg activity tells you far more than the head position alone.
Does vertical flexion apply outside of dressage?
The underlying principles apply to all ridden disciplines. A showjumper that works in a correct, through outline will be more responsive and better balanced approaching a fence than one that runs on the forehand with a hollow back. Even in Western riding, concepts equivalent to vertical flexion exist — the reining horse working in a soft, round frame is using the same biomechanical principles, different terminology notwithstanding. Good equitation is consistent across disciplines in its demand for a horse that engages its hindquarters and works with a soft, relaxed topline.