10/05/2026
Itโs a long read but worth it. I see so many horses struggling and feel this could be the reason.
My mare was one of those and now so much happier and regulated.
๐ด๐ซ ๐ช๐ต๐ฎ๐ ๐ถ๐ณ ๐๐ผ๐๐ฟ โ๐๐ฝ๐ผ๐ผ๐ธ๐โ ๐ต๐ผ๐ฟ๐๐ฒ ๐ถ๐๐ปโ๐ ๐ฎ๐ฐ๐๐๐ฎ๐น๐น๐ ๐ฎ๐ป๐
๐ถ๐ผ๐๐ - ๐ฏ๐๐ ๐ฝ๐ต๐๐๐ถ๐ฐ๐ฎ๐น๐น๐ ๐๐ป๐ฎ๐ฏ๐น๐ฒ ๐๐ผ ๐ฒ๐
๐ต๐ฎ๐น๐ฒ?
This is not always a training problem.
Sometimes, it is a body that cannot regulate itself.
Some horses never truly seem able to switch off.
They spook at shadows. Brace through the whole body. Rush every transition. Struggle to take a deep breath. Hold tension through the jaw, the sternum, the belly. React sharply to the leg. Fight softness in the contact.
And we label them:
Difficult. Anxious. Reactive. Naughty.
But what if the nervous system is responding to something physical - not behavioural?
๐ซ ๐ฆ๐๐ฎ๐ฟ๐ ๐ต๐ฒ๐ฟ๐ฒ: ๐๐ต๐ฒ ๐ฑ๐ถ๐ฎ๐ฝ๐ต๐ฟ๐ฎ๐ด๐บ ๐ถ๐ ๐ป๐ผ๐ ๐ท๐๐๐ ๐ฎ ๐ฏ๐ฟ๐ฒ๐ฎ๐๐ต๐ถ๐ป๐ด ๐บ๐๐๐ฐ๐น๐ฒ.
In the horse, the diaphragm is one of the primary pressure regulators of the entire body.
It attaches to:
โช๏ธ the sternum โช๏ธ the caudal ribs โช๏ธ the thoracolumbar region via the crura โช๏ธ major fascial and visceral structures throughout the trunk
Every single breath ripples outward, influencing: โ๏ธ pressure through the thorax โ๏ธ venous and lymphatic return โ๏ธ rib mechanics and mobility โ๏ธ sternum rotation โ๏ธ thoracolumbar tension โ๏ธ pelvic stability
This means a horse that cannot breathe freely cannot move freely.
It is not just a training gap.
It may be a mechanical one.
๐ก๐ผ๐ ๐ฎ๐ฑ๐ฑ ๐๐ต๐ฒ ๐น๐ฎ๐๐ฒ๐ฟ ๐บ๐ผ๐๐ ๐ฝ๐ฒ๐ผ๐ฝ๐น๐ฒ ๐ป๐ฒ๐๐ฒ๐ฟ ๐ฐ๐ผ๐ป๐๐ถ๐ฑ๐ฒ๐ฟ: ๐ด๐ฎ๐ ๐ฒ๐
๐ฐ๐ต๐ฎ๐ป๐ด๐ฒ.
Breathing is not only about bringing oxygen in.
It is equally about getting carbon dioxide out - efficiently, continuously, with every breath.
If a horse is stuck in a shallow breathing pattern, whether braced in inspiration or expiration, it may not be clearing COโ as efficiently as it should.
The body then has to work harder to maintain acid-base balance - its internal chemical stability.
One of the systems involved in this buffering process?
โก๏ธ The kidneys.
The kidneys help regulate pH by adjusting bicarbonate and hydrogen ion balance, helping the body maintain the narrow blood pH range required for normal function.
This is not dramatic.
It happens quietly.
But over time, in a horse that is chronically restricted and chronically stressed?
The body starts compensating everywhere.
๐ซ ๐๐๐ ๐๐ต๐ฒ ๐ธ๐ถ๐ฑ๐ป๐ฒ๐๐ ๐ฎ๐ฟ๐ฒ๐ปโ๐ ๐ท๐๐๐ ๐ฐ๐ต๐ฒ๐บ๐ถ๐ฐ๐ฎ๐น ๐ฏ๐๐ณ๐ณ๐ฒ๐ฟ๐.
They are physical ones too.
This is where it gets extraordinary and where most people never look.
The kidneys are retroperitoneal, meaning they sit behind the abdominal lining, tucked high under the last ribs.
With every deep, functional breath, the diaphragm moves caudally towards the tail.
That motion does not just move air.
It changes pressure. It moves fascia. It influences organ glide.
The diaphragm is not just breathing.
It is moving the internal body.
If the diaphragm is braced, this physical pumping action becomes reduced.
And in my osteopathic assessment, this can show up as: โช๏ธ lumbar sensitivity โช๏ธ abdominal guarding โช๏ธ reduced rib mobility โช๏ธ pelvic asymmetry โช๏ธ a horse that feels shorter in one stirrup โช๏ธ or a horse that struggles to soften through one side
โก๏ธ ๐ง๐ต๐ฒ ๐ฎ๐๐๐ผ๐ป๐ผ๐บ๐ถ๐ฐ ๐ฐ๐ผ๐ป๐ป๐ฒ๐ฐ๐๐ถ๐ผ๐ป
There is another layer deeper still and this is where behaviour, biomechanics and the nervous system converge.
The vagus nerve passes through the diaphragm via the oesophageal hiatus.
The vagus nerve is part of the โrest, digest and regulateโ system.
So when the diaphragm is chronically tight, restricted or braced, the horseโs ability to access relaxation may be affected too.
This is not โjust anxiety.โ
This is anatomy.
And it is one reason I am always careful about labelling horses as simply difficult, sharp, stressy or naughty.
๐ง๐ต๐ฒ ๐๐ถ๐๐ฐ๐ฒ๐ฟ๐ฎ๐น ๐น๐ฎ๐๐ฒ๐ฟ ๐บ๐ฎ๐๐๐ฒ๐ฟ๐.
The left kidney has fascial and ligamentous relationships with the spleen.
The right kidney sits in close relationship with the liver.
So when the diaphragm is restricted, it does not only affect the lungs.
It can alter the glide, pressure and fascial relationships of the organs beneath it too.
And this is why one-sidedness is not always a schooling problem.
A horse that struggles on one rein, skips a lead, travels crookedly or feels blocked through one side may not simply need more repetition.
They may need the body to be able to organise itself internally first.
Because when you ask for softness, bend, lift, collection or a lead changeโฆ
you may be asking that horse to move through a physical blockage it cannot simply โtry harderโ through.
You are not fighting their mind.
You may be meeting their internal topography.
This is why some horses transform when we shift the conversation to: โ๏ธ rib mechanics and mobility โ๏ธ sternum rotation โ๏ธ diaphragm function and coordination โ๏ธ thoracic inlet restrictions โ๏ธ visceral tension - kidneys, spleen, liver โ๏ธ vagal tone and autonomic regulation โ๏ธ how pressure moves through the whole system โ๏ธ how the horse is actually organising itself internally
Not just:
Can this horse do the movement?
But:
Can this horse regulate itself well enough to even access relaxation?
The horse that looks naughtyโฆ
is sometimes the horse that is working incredibly hard just to stay functional inside a body that is struggling to regulate.
That is not a discipline problem.
That is not a respect problem.
That is not even primarily a training problem.
That is a body asking for help in the only language it has.
And the moment we start listening differently - the whole conversation changes. ๐ด
๐ฌ Have you ever had a horse that felt stuck in the ribs, struggled with one lead, or felt shorter in one stirrup no matter how much you worked on softness?
Drop your experience in the comments - I read every single one.
๐ ๐ฆ๐ง๐ข๐ฃ ๐๐จ๐๐ฆ๐ฆ๐๐ก๐. ๐ฆ๐ง๐๐ฅ๐ง ๐๐ฆ๐ฆ๐๐ฆ๐ฆ๐๐ก๐.
I have put together a Diaphragm & Rib Mobility Checklist - a step-by-step PDF guide to help you start recognising these physical patterns before they are dismissed as โbehaviouralโ problems.
Want the checklist?
Join my email community and Iโll send the guide straight to your inbox. ๐ง๐ด
Register your email here:
https://www.helenthornton.com/email-updates
Itโs free - because horses deserve better than being labelled difficult.
Image: https://pferde-gesund-bewegen.de/das-zwerchfell-oder-auch-diaphragma-des-pferdes/
