Your hypermobile horse feels amazing in May. Loose, swinging, scopey — all the things that made you fall in love with him. Then June hits. The humidity climbs, the ring bakes, and you keep him “in work” because you know fitness matters. Six weeks later he’s shuffling off one shoulder, your vet is talking about soft tissue, and you can’t figure out what went wrong.
What went wrong is that you trained a flexible horse like a stiff one. And heat made it worse.
Here’s the thing about hypermobile horses: the goal was never more motion. It was always more control of the motion they already have.
What Hypermobility Actually Does to a Horse in the Heat
Hypermobile horses have connective tissue — tendons, ligaments, joint capsules — that are more extensible than average. This gives them that eye-catching suppleness. It also means their joints rely more heavily on active muscular support to stay stable, because the passive structures (the stuff that’s supposed to stop the joint from moving too far) aren’t doing as much of that job.
In heat, horses fatigue faster. Core and stabilizing muscles — the ones doing the work your horse’s ligaments can’t — tire quickly in 90-degree humidity. When those muscles give out, the hypermobile horse doesn’t just get tired. He gets sloppy. The joints start moving in ways they shouldn’t. The fetlocks sink a little too deep. The SI disengages. The hind leg swings wide because there’s nothing holding it on a clean arc.
This is when soft tissue injuries happen. Not because you worked him too hard in one dramatic session — because you asked him to keep going past the point where his stabilizers could protect him, day after day, in conditions that accelerated that fatigue.
The Conditioning Trap: Miles Feel Productive
I get it. It’s summer. You have goals. Trail rides look appealing, and long slow distance has legitimate aerobic value. But if your horse is hypermobile, miles without structure are actively counterproductive in hot weather.
Every step at the trot or canter on a loose, inattentive rein asks the horse to find his own balance. A stiff horse will brace. A hypermobile horse will collapse into the path of least resistance — which for him means flopping into whatever joint range his connective tissue allows. An hour of that, in August heat, is an hour of rehearsing instability.
You are not building fitness. You are building a movement pattern that will hurt him.
What Stability Training Actually Looks Like in Summer
Short, frequent, intentional. That’s the framework. Here’s how it translates:
Session length
Cap your working sessions at 20-30 minutes in peak summer heat, with a thorough 10-minute walk warm-up before you ask for anything. This isn’t a fitness limitation — it’s a tissue protection strategy. Your horse’s stabilizing muscles can work hard and stay precise for 20 minutes. After that, in the heat, you’re asking for sloppy reps. Sloppy reps don’t build anything useful.
Quality of contact over quantity of stride
The most important thing you can do for a hypermobile horse is give him something to organize himself around. That means your leg needs to be consistent — not clamping, but present — and your rein needs to offer a steady, honest boundary without pulling. You are the scaffolding while his muscular support develops.
On a circle, this looks like: inside leg to outside rein that means something. The horse should feel like he’s traveling in a tunnel, not drifting laterally. If his barrel keeps falling out through your outside rein, the answer isn’t a stronger hand. It’s a slower pace on a smaller figure until his stabilizers can hold the shape.
Prioritize transitions over track length
Ten minutes of deliberate trot-walk-trot transitions on a 20-meter circle does more for a hypermobile horse than 30 minutes of posting trot on the buckle. Transitions force recruitment of the postural muscles — the deep thoracolumbar fascia, the core stabilizers, the musculature around the SI joint. Each downward transition is a moment where your horse has to catch himself rather than let momentum do the work. That catching is the training.
Aim for a transition every 6-10 strides in hot conditions. Keep the trot short, balanced, and through. Reward the effort with a real walk break.
Lateral work as stability training, not suppleness work
This is a distinction I talk about a lot on The Elevated Equestrian podcast: lateral work with a hypermobile horse isn’t about achieving more bend. It’s about teaching the horse to step under and across with control, without dumping onto the forehand or collapsing through the ribcage.
Leg yield on the quarter line — not the wall — is one of my go-to exercises in summer. The lack of a wall to lean on forces honest engagement. Keep it to three or four quality strides, then straight. Straight, then three or four strides again. The straight work immediately after is where you’ll feel whether the stabilizers actually fired or whether the horse just moved sideways.
Ground work days count
In extreme heat, a lunging session or in-hand work may be genuinely more appropriate than riding. This isn’t a cop-out. For a hypermobile horse, in-hand lateral work — travers, renvers steps, shoulder-in position — lets you see exactly what’s happening with the hind legs without the added challenge of carrying your weight. Two or three ground work sessions a week in July and August is not losing fitness. It is targeted stability training in conditions where riding would cost more than it gives.
Signs You’ve Crossed the Line
Watch for these in summer with a hypermobile horse:
- Hind leg swinging wide consistently in trot — not occasional, but every stride late in the ride
- Stumbling or toe-dragging that gets worse as the session continues
- Reluctance to step under in downward transitions that he was doing well earlier in the week
- Short, choppy steps replacing his usual swing — this is the stabilizers giving out, not stiffness
Any of these mid-session means you’re done for the day. Not “five more minutes” — done. That’s not softness. That’s reading your horse correctly.
The Mindset Shift
The riders who do best with hypermobile horses are the ones who stop measuring a good session by how much ground they covered and start measuring it by how much quality they got. Twenty clean, stable minutes is a victory. Forty sloppy minutes is a setback.
Summer forces that reckoning. The heat removes the option to just push through. Use it as information.
If you want to understand the full picture of what’s happening in a hypermobile horse’s body — why the connective tissue behaves the way it does, how to design a training week that builds instead of breaks, and what to tell your vet and farrier so everyone is working from the same framework — that’s exactly what my book covers.
Get early access and a free introductory lesson at samanthabaer.com/free-lesson. If you’re in the middle of a summer where nothing is adding up, this is a good place to start.
