How relaxation drives performance.
We tend to talk about endurance as toughness: the ability to push through discomfort and keep going. That’s part of it, but the runners who last, and who run well while they’re at it, usually have something else underneath. They’re calm. Not the gritted-teeth calm of someone holding it together, but a learned, practised calm that lets the body coordinate, breathe and work efficiently even when it’s under strain. It isn’t passive. It’s a physiological state, and like most physiological states, it can be trained.
The Science of Calm
Every movement starts as a signal from the brain. When the nervous system is stressed, those signals get noisier. Muscles that should be resting stay switched on, coordination gets a little ragged, and breathing becomes shallow and rushed. You spend more energy to cover the same ground.
Hard running does need the sympathetic nervous system, the “go” side of the system. Heart rate, breathing and alertness all have to rise. What calm does is keep that response proportionate. The effort gets what it needs, and nothing extra goes into tight shoulders, a clenched jaw or a racing mind. In that state the brain has more room to fine-tune movement, and the body stops paying for effort that isn’t moving you forward. You’re not relaxed instead of performing. You’re relaxed so that you can.
Breathing is the most direct line we have into this. A steady, rhythmic breath tells the brain things are under control, and the body tends to follow.
Breathing as the Access Point
The quickest way to lose calm is to lose the breath. When breathing runs ahead of what the effort needs, you blow off too much carbon dioxide. Blood chemistry shifts, and haemoglobin holds on to oxygen a little more tightly instead of releasing it to the tissues, the flip side of what physiologists call the Bohr effect. You end up working harder to breathe without getting much for it, and usually feeling more panicked as a result.
The fix starts with noticing. Let the breath settle into a steady rhythm and pay attention to it rather than forcing it. On the run that looks like smooth exhales, a consistent rhythm and an upper body with no obvious tension in it. With practice, calm stops being something you hope to feel and becomes something you can return to.
That’s why breath work is part of our training. We don’t treat it as meditation. We treat it as a performance skill, alongside aerobic fitness and strength, because the breath is what links the aerobic system, the muscles and the nervous system.
Training the Calm Response
Staying calm under pressure doesn’t happen by accident. Every hill, threshold session and hard interval is a chance to practise keeping the breath steady and the body quiet while the intensity climbs. That, more than any single workout, is where the craft of endurance lives.
Researchers sometimes call this autonomic flexibility: the ability to move smoothly between stress and recovery. Athletes who adapt well tend to switch on when it’s needed, do the work, and then come back down quickly. They don’t stay wound up after a session. Heart rate and breathing settle, and they move on.
This runs through how we coach at Mindful Runner. Every session is built around four steps: Intent, Focus, Practice and Reflection. The reflection afterwards is there to help you learn from an effort without dragging its stress into the next one. The aim isn’t only to get stronger. It’s to get calmer under load.
Trail Running: Calm in Motion
Trails test this constantly. The ground keeps changing and asks for balance, quick decisions and steady focus, and technical terrain punishes tension. A stiff runner catches a toe or plants a foot badly; a relaxed one adjusts. Loose shoulders, quiet arms, eyes up and breathing that moves with the body are what that looks like in practice.
There’s a perception side to it as well. As anxiety climbs, attention narrows and you start reacting late. Stay settled and you read the trail better and earlier. It’s one of the clearest places to see physiology and awareness working together.
That’s why our Trail Skills courses work on proprioception and decision-making as much as fitness. Part of the job is teaching the nervous system to stay composed when things get complicated underfoot.
The Psychology of Calm
Calm isn’t the absence of energy. It’s energy in order.
Before a big race or a hard session, most of us get butterflies. That’s the sympathetic nervous system doing its job, getting the body alert and ready. What matters is what you do with it. Tense up against the feeling and readiness turns into anxiety. Breathe into it, accept it and put it to use, and you’re closer to the old line about getting the butterflies to fly in formation. The physiology barely changes between nervous dread and excited anticipation: heart rate up, blood moving, muscles primed. What changes is how you read it. You’re not trying to get rid of the butterflies, just to put them to work.
A lot of that comes down to trusting your preparation. We move best when we let the body run the patterns we’ve practised. Most of what happens in a good stride, the foot placement, the arm carriage, the small correction on a loose rock, is handled below conscious thought. Running gets ragged when the thinking brain tries to take over. You’ll know the feeling: under real stress you start second-guessing every step, it edges towards panic, and the smoothness goes.
So in a race, I tell athletes to get out of their own way. Look after your breathing and your pacing, and leave the rest to your body. It knows what to do, because you’ve spent months teaching it.
The catch is that it will do exactly what you’ve taught it. Under pressure the body falls back on whatever it has practised most, good or bad. Distracted, sloppy training builds sloppy patterns, and those are the ones that turn up late in a race when you’re tired and stressed. That’s why we ask for intent in every session, easy runs included. Each one shapes what your body will do later, once you’ve stopped thinking about it.
Calm on race day is usually the visible end of a lot of quiet work beforehand.
We see this on our residential trail courses at Windrush in Hogsback. When Mindful Runners work through tough terrain together, composure spreads. You watch someone stay steady through a rough patch and it gets easier to do it yourself. The quiet at the end of a long day on the trails, everyone fed and tired, is about as good a picture of calm as we know.
Cultivating Calm
You can’t fake calm, but you can practise it.
Start on easy runs by paying attention to your breathing. When it gets forced, let it settle back into a rhythm. In hard sessions, focus on smooth exhales through the toughest parts. Away from running, try settling your breath before you react to something. Each small repetition teaches the nervous system to choose composure over chaos.
Over time you may notice that your best runs are also your quietest. Effort feels smoother, focus sharpens and time seems to stretch. That’s what we mean by calm as a performance state rather than an idea.
Looking ahead
Athletes have more data than ever: recovery scores, readiness metrics, endless optimisation. The most useful performance tool is still the simplest. Calm costs nothing, doesn’t show up neatly on a dashboard and can’t be handed off to an app. You build it through attention, repetition and patience.
At Mindful Runner we train calm as seriously as we train endurance, because a steady breath and a settled mind make hard running more manageable, and they tend to keep you in the sport for longer.
This is the first of three pieces on how calm, practice and breath fit together. Next, we look at why the body moves best when you get out of its way.
Explore further
Breathwork for Runners: coming soon
Residential trail courses: from Trail Skills to Advanced Mountain Ultra, learn to move calmly and efficiently on technical terrain
Coaching Plans: structured training for performance and longevity