Jean Luc Cornille

 

“Suspension and amplitude are not created by stretching and relaxation, but through the appropriate coordination and stiffness of elastic structures.”

— Jean Luc Cornille

Movement is not created by muscular contraction alone.

The horse's body functions as an integrated system in which muscles, tendons, fascia, joints and other connective structures interact continuously with gravity, ground reaction forces and inertia.

Within this system, muscles may work concentrically, eccentrically or isometrically while tendons and other elastic structures deform, store energy and return part of that energy during locomotion.

This interaction between muscular force and elastic structures is fundamental to efficient movement.

 

In many athletic movements, an active lengthening of the muscle-tendon system precedes shortening. This sequence is commonly described as the stretch-shortening cycle.

The principle can easily be observed in human athletics.

During throwing, jumping and running, the athlete does not produce power through one isolated muscular contraction. Movement results from a precisely timed sequence involving multiple body segments, muscular actions and elastic structures.

The horse is different anatomically from the human athlete, but the fundamental principle remains relevant: efficient locomotion depends upon the coordination of force throughout the entire body.

The hind limbs, back and forelimbs do not function as independent mechanical units.

They function as parts of a coordinated system.

The rider cannot directly control each muscle, tendon or deeper structure involved in this process. The rider can, however, influence the conditions under which the horse's nervous system organizes them.

This distinction is fundamental to intelligent equine training.

We do not manually position the deeper structures.

We create the conditions allowing the horse to coordinate them.

 

The horse's limbs are remarkably specialized for economical locomotion.

Long tendons associated with relatively short muscle fibers allow portions of the limb to function as elastic energy-storage systems.

As the limb accepts load, elastic structures can deform and store strain energy. As loading changes, part of this energy can subsequently be returned.

This reduces the amount of muscular work required for locomotion.

The horse therefore does not move efficiently simply because muscles contract harder.

Efficient locomotion depends upon when force is produced, how force is transmitted through the body, how tissues deform under load, and how effectively elastic energy is stored and returned.

This is considerably more sophisticated than the traditional opposition between contraction and relaxation.

 

The word stiffness is often misunderstood in equestrian language.

Stiffness does not necessarily mean rigidity.

In biomechanics, stiffness describes the relationship between an applied force and the deformation of a structure.

A structure that is excessively compliant may deform without efficiently returning useful energy. A structure that is excessively rigid may be unable to accommodate the forces and movements required of it.

Athletic efficiency exists between these extremes.

The horse continuously adjusts the stiffness of muscles, tendons, joints and the body as a whole according to the mechanical demands of each instant.

This is functional stiffness.

It is not muscular rigidity.

Nor is it relaxation.

Rigidity and slackness represent two extremes. Neither describes efficient athletic locomotion.

The athletic horse needs sufficient stiffness to resist inappropriate deformation, transmit forces and utilize elastic recoil while retaining the mobility necessary to coordinate the next phase of the stride.

This is why the traditional instruction to simply make the horse “relax” provides an incomplete explanation of efficient movement.

The objective is not relaxation.

The objective is coordination.

 

The efficiency of elastic energy storage and return depends strongly upon timing.

This brings us to one of the most important elements of athletic training:

cadence.

Every horse has individual anatomical proportions, muscle architecture, tendon properties, neurological organization and habitual patterns of coordination.

Consequently, there cannot be one mechanically ideal cadence imposed upon every horse.

The appropriate cadence must emerge from the individual horse's functional organization.

The rider's responsibility is not to impose speed.

The rider's responsibility is to create the balance and coordination that allow the horse to use force efficiently.

This distinction is essential.

Forward movement is not a body moving faster.

Forward movement is the efficient management and transmission of the forces generated during locomotion.

A horse can move rapidly without moving efficiently.

Increasing speed may actually reduce the horse's ability to coordinate the forces acting through the body if the increased tempo exceeds the horse's current capacity for balance and coordination.

Rushing is therefore not engagement.

Speed is not impulsion.

And faster is not necessarily more forward.

 

During locomotion, mechanical energy may be stored temporarily within elastic structures and subsequently returned.

But this process depends upon timing.

If loading, deformation and recoil are poorly coordinated, energy cannot be used in the same efficient manner.

The appropriate cadence therefore allows the horse's nervous and musculoskeletal systems the time necessary to organize the sequence of loading, stabilization, elastic deformation and recoil.

This is why cadence cannot simply be dictated by fashion, judging standards or a metronome.

The correct cadence is individual to the horse.

It may also change as the horse develops greater balance, coordination and athletic capacity.

Training should improve the horse's ability to organize movement rather than forcing the horse to reproduce an externally prescribed image.

 

Living tissues respond to mechanical loading.

Muscle, tendon, bone and connective tissues are not inert materials. They adapt over time according to the mechanical environment repeatedly imposed upon them.

This biological responsiveness to mechanical forces is central to the concept of mechanoresponsiveness.

Appropriate loading can stimulate useful adaptation.

Excessive, repetitive or poorly coordinated loading may instead exceed the adaptive capacity of tissues.

Training therefore does considerably more than teach movements.

Training creates a mechanical environment to which the horse's body adapts.

Every stride is mechanical information.

Every repetition is a stimulus.

Every compensation repeated often enough can become part of the horse's habitual organization.

This is why correcting the visible gesture without correcting the underlying coordination is insufficient.

 

 

Eccentric muscular activity provides a useful example of the body's capacity for adaptation.

When a person walks downhill, the knee extensor muscles work eccentrically to control the descent against gravity.

Someone unaccustomed to this activity may experience considerable muscle soreness afterward.

With repeated exposure, however, the muscular system adapts and the same exercise generally produces considerably less damage and soreness.

This phenomenon demonstrates an important principle:

the body changes in response to the mechanical demands repeatedly placed upon it.

The same principle should influence the way we think about equine training.

The goal cannot simply be to make the horse perform a movement.

We must consider what mechanical conditions the repeated movement is creating within the horse.

 

Elastic recoil should not be imagined as a passive rubber band hidden somewhere within the body.

The behavior of the muscle-tendon system depends upon muscular activation, tendon properties, joint position, loading, timing and neural coordination.

Even within muscle fibers, proteins such as titin contribute to passive and active mechanical properties and participate in the complex regulation of muscular force.

The contemporary understanding of locomotion therefore moves far beyond the simplistic choice between contraction and relaxation.

The horse's body is continuously regulating force and stiffness.

This regulation is dynamic.

It changes from one instant to the next.

It changes with speed.

It changes with balance.

It changes with fatigue.

And it changes through training.

 

Greater suspension and amplitude cannot simply be created by stretching the horse farther or driving the horse faster.

They are consequences of organization.

When forces are efficiently coordinated through the horse's body, muscular activity and elastic structures can work together more effectively.

The resulting stride may become more expressive without becoming hurried.

Amplitude can increase without losing balance.

Suspension can increase without artificial exaggeration.

The visible movement is the consequence.

It is not the cause.

This distinction separates athletic development from the imitation of athletic movement.

 

The same reasoning applies to neck posture.

A predetermined neck position cannot be mechanically correct for every horse at every stage of training.

The posture of the neck participates in the horse's global coordination and balance.

Forcing a horse into a low or predetermined outline while simultaneously increasing speed may create the appearance expected by a particular training system, but appearance alone tells us very little about the mechanical efficiency of the horse.

The question should never simply be:

Does the horse fit the desired outline?

The better questions are:

Is the horse balanced?

Is force being coordinated efficiently?

Can the horse maintain the movement without compensatory tension or excessive effort?

Is the movement comfortable for the horse and rider?

A visually rhythmic trot is not necessarily a mechanically efficient trot.

Rhythm can be imposed.

Coordination must be developed.

 

Equestrian tradition has often concentrated upon what can be seen from the outside:

the position of the neck,

the speed of the gait,

the trajectory of the limbs,

the outline of the horse.

But locomotion is generated by processes that cannot be judged from appearance alone.

The visible gesture is the final expression of an extraordinarily complex interaction between neural control, muscular activity, elastic structures, gravity, inertia and ground reaction forces.

Training based primarily upon reproducing the visible gesture therefore risks confusing the effect with the cause.

The horse does not become athletically correct because the horse resembles the picture.

The picture becomes correct when the horse has developed the coordination capable of producing it.

 

The horse is not a machine composed of independent pieces that the rider can stretch, strengthen or relax separately.

The horse is an adaptive biological system.

The tissues respond to loading.

The nervous system responds to experience.

Movement patterns respond to repetition.

Training therefore has consequences far beyond the few seconds during which an exercise is performed.

The rider is continuously influencing the mechanical environment from which the horse's future movement will develop.

This is the responsibility—and the extraordinary possibility—of equine education.

The objective is not greater effort.

It is greater efficiency.

Not greater speed.

Better coordination.

Not relaxation instead of stiffness.

Appropriate stiffness instead of rigidity.

Not the imitation of movement.

The development of the biological and mechanical conditions from which sound movement can emerge.

This is mechanoresponsiveness.

And this is why the horse's individual cadence, balance and coordination must remain at the center of intelligent athletic training.

Jean Luc Cornille

Science of Motion

SCIENTIFIC REFERENCES & FURTHER READING

The concepts discussed in this article are supported by continuing research into equine biomechanics, muscle-tendon function, elastic energy storage, neuromuscular coordination and the influence of head and neck posture on locomotion.

Clayton, H.M. (2026).

Biomechanics of the Head and Neck.

Veterinary Clinics of North America: Equine Practice, 42(1), 1–13.

doi: 10.1016/j.cveq.2025.12.004

A contemporary review of equine head and neck biomechanics describing the role of gravitational and inertial forces, eccentric-concentric muscular cycles and energy-saving stretch-recoil behavior of the nuchal ligament during locomotion.

Biewener, A.A. (1998).

*Muscle-tendon stresses and elastic energy storage during locomotion