What Coordination Really Is
The Performance Hierarchy: Part 4
In cross-country skiing, the difference often shows up on a climb.
Two athletes hit the base only a few seconds apart and start uphill at about the same speed. For a moment, nothing looks settled. Both are under pressure and both are clearly working. Then the hill starts asking harder questions. One skier begins to lose velocity almost immediately. The speed bleeds off. Every meter costs more than the last. They are still fighting and still pushing, but the return on that effort gets worse as the climb goes on. The other skier does something every experienced coach recognizes, even if they do not always describe it cleanly. They keep turning effort into travel. Midway up the hill they close the gap, pass cleanly, and carry speed over the crest and into the downhill.
From the outside, it is tempting to call this fitness. Sometimes fitness is part of the answer. But often the more useful distinction is that one athlete is holding together a better solution. They are directing force more cleanly, preserving momentum more effectively, and paying a lower internal price for the same external problem. In engine sports, coordination is often treated as secondary, something cosmetic or athlete-specific, while the real work is assumed to be physiological. Build the engine, improve the thresholds, raise the outputs, and trust that performance will follow. But if the first three posts in this series are right, that order is incomplete. Athletes do not simply bring fitness to a task. They bring a way of solving it. The task has already been defined by its constraints. The platform has already been shaped by the athlete’s postural organization. What remains is the question of how the nervous system turns available energy into useful action. That is the job of coordination.
It also helps explain why performance can begin to drift before the stopwatch fully shows it. The athlete is still working, and the effort may still be high, but less of that effort is being turned into useful displacement. More of it is being spent just to keep the system together. That is where inefficiency begins.
Coordination gets used loosely in sport. Sometimes it means rhythm. Sometimes it means smoothness. Sometimes it is just a polite way of saying an athlete looks good. None of those meanings are precise enough here.
In this framework, coordination is not style, and it is not just inter-limb timing. Timing matters, but it is only one part of the problem. Bernstein’s foundational insight was that the body has more available degrees of freedom than any one movement problem requires, so skilled action depends on organizing that abundance into a stable, functional pattern rather than letting the system behave chaotically. In sport, that organization includes timing between limbs and segments, but also posture, force direction, sequencing, stiffness, balance, and how well the athlete manages the relationship between the center of mass and the base of support. Coordination, in other words, is the nervous system’s whole-body solution to the task (Bernstein, 1967).
That is why coordination should not be reduced to how an athlete looks. A movement can appear clean and still be expensive. A movement can look unusual and still solve the task extremely well. The important question is not whether the athlete matches a visual model. The real question is whether their current solution displaces the center of mass at the goal velocity, for the required duration, at the lowest cost the event allows.
This matters most when athletes are already highly trained. Once two athletes arrive at the starting line with nearly identical physiological profiles, the issue is no longer just fuel capacity. Both may have enough engine to do the job. The real task is the efficient utilization of that capacity. Who can turn that fuel into useful displacement of the center of mass? Who can hold that displacement at race velocity without the internal price rising too quickly?
Coordination is the means by which physiology becomes performance. This fits with a broader endurance literature that has long treated physiology as necessary but not fully sufficient, especially once athletes are highly trained and economy begins to separate them more clearly (Joyner & Coyle, 2008; Barnes & Kilding, 2015).
This is why coordination sits so close to the center of the series. It is the means by which the athlete turns intention, structure, and available capacity into actual movement. Different solutions utilize similar physiological capacity at different costs. That is the deeper point running through the whole argument.
Two athletes can face the same hill, start at the same speed, and work equally hard. But if one is spending more of each stride correcting, stabilizing, or reassembling the movement, then less of that effort is available for useful travel. The external task is the same. The internal price is not.
This is where displacement becomes important. Displacement here does not just mean visible movement. It means useful movement of the center of mass through space. In engine sports, that is the real job. The athlete is not just trying to create motion. They are trying to organize force, timing, and structure well enough to move the system’s center in a useful direction through the task. That is not the same as gross movement. An athlete can look active, forceful, even explosive, and still fail to meaningfully improve displacement of the center of mass. If force is mistimed, badly directed, or absorbed by avoidable stabilization and correction, more of the effort stays inside the system as cost instead of becoming forward travel.
This is what coaches are often seeing when one athlete looks quiet and another looks busy. The quiet athlete is not necessarily trying less. They are simply spending less of each cycle on correction, compensation, and avoidable stabilization. More of what they produce becomes useful displacement. The busy athlete may be working just as hard in the everyday sense of that phrase, but more of that work is getting absorbed by the system itself before it ever becomes speed. Once you see that clearly, economy stops looking like a property that belongs only to the engine and starts looking like a consequence of how the athlete solves the task.
Economy is usually described as the oxygen cost of producing a given speed or power output. It’s a useful description, but it can make economy sound like a property that simply belongs to the engine. In practice, economy is also shaped by how the athlete solves the task. If two athletes produce the same external result through different movement solutions, the internal cost will not match perfectly. One solution may recycle force better, preserve rhythm more cleanly, and require less unnecessary muscular activity. The other may impose a larger postural tax, more braking, more correction, or more wasted motion. The output looks similar. The bill does not.
Running research points in this direction. Among trained runners, economy varies meaningfully even when VO₂max does not, and better performers often show different neuromuscular signatures, including shorter ground contact times, different pre-activation patterns, and lower muscle activity in key phases of propulsion. That does not prove coordination explains everything. It does suggest that the way the task is organized changes the price of producing useful displacement (Barnes & Kilding, 2015).
The same logic holds across sports. In skiing, a well-coordinated athlete preserves momentum through transitions and directs force into the ski at the right time and in the right direction. In rowing, a better-organized athlete connects the blade to the water without spending too much of the stroke stabilizing the platform first. In cycling, a well-coordinated athlete holds position, timing, and force transfer with less waste through the trunk and upper body. The key distinction is not effort in the abstract. It is how much of that effort becomes useful displacement inside the task.
Coaches often reach for the language of efficiency here, but that word can get vague unless we say what it means. A coordinated solution is cheaper because it reduces internal interference. Less of the athlete’s output is lost to unwanted motion. Less muscular effort is spent cleaning up posture that broke down a fraction of a second earlier. Less attention is consumed by reassembling the movement in real time. The nervous system is not just producing force. It is organizing the whole body well enough that force can go somewhere useful.
This is why coordination is not an aesthetic extra. It is the mechanism that decides whether available capacity becomes performance or just expenditure.
It also helps explain why some athletes improve their fitness without getting proportionally faster. The engine may improve, but it is still being routed through the same expensive solution. The athlete can now hold that solution longer, or suffer through it more successfully, but the solution itself is still leaking energy. They become more durable in a pattern that remains suboptimal. This is one reason the distinction between training better and competing better matters so much. Training can reward repeatability inside a narrowed environment. Competition rewards whatever solves the real task at the lowest usable cost. Those are not always the same thing.
A mechanically expensive solution can survive in training for a long time, especially when the environment is controlled, the terrain is familiar, and the pace is manageable. But once the task becomes harder; a steeper climb, a faster race, a longer exposure, a more chaotic field, the hidden costs begin to show. The athlete is no longer just producing output. They are trying to preserve the pattern while the cost of preserving it keeps rising. That is one reason a change in performance can come through a neuromuscular and coordinative pathway rather than through a larger aerobic engine alone. In trained runners, explosive-strength work has improved running performance and economy without improving VO₂max, which is exactly the kind of finding that should make coaches slow down before assuming every plateau is a pure capacity problem (Paavolainen et al., 1999).
This is where motor learning belongs in the discussion, but only lightly. Practice does not just build general conditioning. It also stabilizes a solution. Repeated exposure helps the athlete learn which timing relationships, force directions, and postural organizations are most effective for the task. With enough representative practice, the pattern becomes more stable, more economical, and more robust under pressure. The reverse is also true. If training repeatedly rehearses a noisy, expensive, or task-distorted pattern, the athlete may become more durable in exactly the wrong thing (Davids et al., 2008; Pinder et al., 2011).
That brings us to fatigue. Fatigue matters in engine sport, but not only because it reduces output. Coaches often notice something more subtle first. The athlete is still trying. The effort is still high. The external pace may not have changed much yet. But the quality of the pattern begins to slip. The athlete is no longer preserving useful displacement of the center of mass as cleanly as they were earlier in the effort. They are still moving. They are just getting less forward return from each cycle.
That distinction matters. Fatigue is often described as if it were simply a shrinking energy supply or a declining force ceiling. That is part of the picture, but it is not usually the first thing a coach sees. What a coach sees is that the movement gets noisier. Timing becomes less precise. Force arrives a little later or in a slightly worse direction. The athlete spends more time correcting posture, rebuilding rhythm, or stabilizing the system before they can drive it forward again. Fatigue does not just make the athlete weaker. It makes the solution harder to hold together.
This is exactly what coaches see on climbs, late in races, and in hard intervals. Early on, the athlete moves cleanly. The center of mass keeps traveling in the right direction with relatively little wasted motion. As demand rises, the same athlete may begin to lose that clarity. The trunk starts doing more work just to hold shape. The rhythm gets heavier. The athlete is still fighting the course, but they are now spending more energy to achieve less displacement.
That change often appears before a dramatic slowdown. The visible pace may hold for a while. But the athlete is no longer paying the same price for the same task. The solution has become more expensive.
A well-coordinated athlete does not avoid fatigue. They manage its effects better. They preserve timing longer. They keep force flowing into useful displacement longer. They lose less of each movement cycle to internal interference. That is one reason better athletes often appear calmer under pressure. It is not always that they are trying less. It is that they are holding together a cheaper solution for longer.
This also helps explain why performance can fall apart suddenly after looking stable for quite a while. The athlete may appear to be coping, but underneath that appearance the solution is getting progressively more expensive. Small losses in timing, posture, and direction of force accumulate. At some point, the cost of preserving the movement becomes too high. What looked manageable a minute earlier starts to unravel. The athlete is not just tired. They are no longer solving the task well enough to keep turning effort into displacement.
That is why coordination loss under fatigue is such a useful coaching signal. It tells you something more valuable than simple suffering. It tells you where the current solution begins to fail. The practical question is not just, “How tired is this athlete?” It is, “At what point does this athlete stop preserving useful displacement of the center of mass and start spending more just to keep the movement together?” That threshold is often more revealing than a generic marker of effort because it speaks directly to the quality of the solution the athlete is actually carrying into competition.
This does not mean every performance loss is caused by coordination breakdown, or that physiology suddenly becomes secondary. It means that in engine sports, rising fatigue often becomes visible first as worsening coordination and declining transfer of effort into displacement. The athlete is not simply producing less. They are organizing less well. Once that starts to happen, the body is no longer experiencing the same task in the same way.
This is the next step in the hierarchy. Coordination determines how the athlete organizes the task. That organization shapes what kinds of forces are produced, how cleanly the center of mass is displaced, how much unnecessary stabilization is required, and how much internal correction the system has to absorb. Taken together, those demands create a stress profile.
Stress profile is simply the total pattern of cost created by the solution. It includes the physiological cost, but it is not limited to physiology. It also includes the mechanical and coordinative price of holding the pattern together. That distinction matters because two athletes can perform what looks like the same session or race segment while creating different stress profiles inside the body.
One athlete may preserve a cleaner solution. Their center of mass continues to move usefully through the task. Timing remains stable. Force is routed in the right direction with relatively little wasted motion. The stress is still real, sometimes extremely high, but it is concentrated around the actual demands of the event. The other athlete may be solving the same nominal task while creating a very different internal experience. More trunk effort is needed just to preserve position. More muscular work is lost to braking, correction, and reassembly of the movement. More of the effort budget is being spent on keeping the system from unraveling. The external demand may look identical. The internal stress profile is not.
This is why coordination loss matters so much for training theory. It is not just a visible drop in movement quality. It is a change in the stimulus the body is receiving. Once the pattern becomes more expensive, the athlete is no longer just accumulating more fatigue in a general sense. They are accumulating a different kind of fatigue, one shaped by the altered pattern itself. The body is now being asked to adapt not only to the intended task demands, but also to the compensations, inefficiencies, and internal interference that came with the degraded pattern.
The hidden consequence of getting coordination wrong is not only that performance drops in the moment. The larger problem is that repeated exposure may start teaching the body to survive an increasingly expensive pattern rather than improving the one the athlete actually needs. This helps explain why training can sometimes produce athletes who are durable, but not proportionally competitive. They have adapted, but they have adapted to the stress profile created by their current way of moving. If that pattern is noisy, fragile, or too costly, the body may become better at tolerating the wrong thing.
That is a very different model from the standard fitness-first view. In the standard view, training stress is mostly something prescribed from the outside: volume, pace, duration, intensity zone, power target. Those things matter, of course. But they do not tell the whole story, because the actual stress experienced by the athlete depends on the movement pattern carrying those loads. The same workout placed on two different coordination patterns does not create the same adaptation pressure.
That is the real bridge between coordination and adaptation. Before asking what training is building, a coach has to ask what kind of stress the athlete’s current solution is actually generating. Is the athlete rehearsing a pattern that channels force into useful displacement under competition-like conditions? Or are they repeatedly accumulating load in a way that teaches the body to tolerate leakage, compensation, and rising internal cost?
The body will adapt either way. It just will not adapt to the same thing.
That is where the next post begins. If coordination shapes the stress profile, then training is not simply building fitness in the abstract. It is building the capacity to sustain whatever solution is being rehearsed.
References
Barnes, K. R., & Kilding, A. E. (2015). Running economy: Measurement, norms, and determining factors. Sports Medicine - Open, 1(1), Article 8.
Bernstein, N. A. (1967). The co-ordination and regulation of movements. Pergamon Press.
Davids, K., Button, C., & Bennett, S. (2008). Dynamics of skill acquisition: A constraints-led approach. Human Kinetics.
Joyner, M. J., & Coyle, E. F. (2008). Endurance exercise performance: The physiology of champions. The Journal of Physiology, 586(1), 35–44.
Paavolainen, L., Häkkinen, K., Hämäläinen, I., Nummela, A., & Rusko, H. (1999). Explosive-strength training improves 5-km running time by improving running economy and muscle power. Journal of Applied Physiology, 86(5), 1527–1533.
Pinder, R. A., Davids, K., Renshaw, I., & Araújo, D. (2011). Representative learning design and functionality of research and practice in sport. Journal of Sport & Exercise Psychology, 33(1), 146–155.