Commentary — this one's off the podcast calendar entirely, a reactive piece tied to a news item rather than an episode.

The Constraints Collective · Blog · September 2026

Somewhere in England's team hotel before the UEFA Nations Cup tie at Wembley against the football World Champions, Spain, a full-back will have been shown a clip reel. He will have been told which way Lamine Yamal likes to go with the ball in a 1v1 dyad, when he checks back, and what happens after the stop. He will know a great deal about Yamal. During the game he had to defend him anyway.

Yamal knows this is happening and what is coming. Ahead of the game, he told The Guardian that defenders arrive with a coach's briefing on what he does, and that he thinks of them as machines programmed to shut him down. His answer is simple: "I try to play with opponents, [and] ensure they can't mechanise me."

That line deserves more attention from coaches than it will get from most football pundits. The article provides a young elite player's experiential account of something we have tried to explain from an ecological dynamics perspective and it points straight at the thing coaches can influence: practice designs need a logic.

The Full-Back Has a Dossier. Yamal Has a Duel.

"Knowledge about: the dossier, the scouted pattern, one option on a fixed board."

The distinction that matters here goes back to James Gibson's ideas about the difference between knowledge about something and knowledge of it. Knowledge about the environment is verbal, visual, propositional and procedural. It can be written on a whiteboard or watched on a screen, verbally stated in a meeting ("If that…..then this") or tested in a quiz. Knowledge of the environment is direct, transactional and action-specifying. It concerns the live coupling that emerges between how a player addresses the performance context and what they perceive in each unfolding 'situation' (Turvey, 1992). In a situation, how their action is produced and continuously adjusted is based on their intentions, such as goals, ongoing actions, anticipated interactions, as well as the current layout of the environment. In respect to Yamal, the specific context of a one-on-one interaction is shaped by his ability to attune to and exploit the field of affordances available in that context (Mohammedi and Koutamanis (2025).

The full-back's briefing is replete with 'knowledge about' Yamal. It is statistically accurate, but is inert at the moment it is needed on field. Yamal's action is not a pattern that can be easily retrieved because it has not been mechanised and automatised. The way he addresses a performance context is an emergent solution settling in real time onto whatever the defender's position, balance and intention solicit in a 1v1 dyad. When Yamal checks, sells the dummy and cuts back, he is exploiting what the defender has just offered him.

"Knowledge about a principle does not become knowledge of it through instruction, however precisely the instruction is formulated." - Ian Renshaw, Coaching the Principles of Play from an Ecological Dynamics Perspective

Even the move Yamal credits to hours of watching Neymar in performance only became his in the duel. Watching opened up a possibility to explore. Knowledge of it had to be built against real defenders, through repetition without repetition (Bernstein, 1967), since each duel is unique.

Mechanised Practice Builds Mechanised Players

"Mechanised: the same fixed pattern, retrieved and repeated on cue."

If knowledge about the environment cannot be converted into knowledge of it, then a great deal of traditional practice is aimed at the wrong target. Drills that rehearse a fixed pattern through continuous repetition after repetition, with the coach narrating the rule as players execute it, build players who know what they are supposed to do. They do not necessarily develop players who can perceive when to do it, or when to do something else. As a basketball friend of ours told us, this approach is only useful if the opponent does what they are 'supposed to do'; and they rarely do!

There is a second cost. The movement scientist and psychologist Rich Masters' research has revealed that skills built on a heavy explicit, verbal knowledge base are more prone to breaking down under competitive pressure. The ecological reading of that finding is sharper than the original explanation. A practice history full of verbal instruction does not just fail to help. It trains a habit of attending to the wrong source of (non-specifying) information.

"A practised habit of attending to self-produced symbolic content… in place of the environmental information on which the skill in question actually depends." - Ian Renshaw, Coaching the Principles of Play

Under the pressure of a tournament knockout game, that habit is exactly what gets recruited. A player told all week to "check whether this is the moment to penetrate" has practised checking. Yamal has practised playing. That is the difference between a player who has practised picking-up specifying information about what an opponent offers them and those who can't.

Tight, Loose, and Everything In Between

"Not a fixed point - a continuum you're actively balancing on."

None of these ideas imply that coaches should never narrow a task in practice. Keith Davids and I have argued that task constraints sit on a continuum. At one end, practice designs (with limited task constraints), that have been tightened by a coach, make a narrow field of affordances available: useful for a beginner searching to stabilise a first functional coordination pattern, or for a team preparing against a specific opponent with automated performance tendencies. Such an approach may be more useful when travel and recovery leave little practice time available between competitive events. At the other end of the constraints continuum, loosened design logic offers a rich, more 'neutral' landscape to search, explore and discover in.

The design logic does not address which end is correct. It is about being able to say exactly why this mix of constraints may be used, for this player, right now.

"Coaches should not 'plant' an individual learner down at one end of the practice continuum… and leave them there for too long a time." - Keith Davids & Ian Renshaw, Task Constraints Exist on an Ecological Continuum

A player who has only ever lived at the tightened end of the continuum is a player who can be mechanised. Their repertoire is limited, stable and repeatable, and easy to put on a clip reel. The players that Yamal name checks in the article as having that 'spark', himself and Pedri among them, are players who have spent a long time attentively dwelling in loosened landscapes, exploring ways to succeed by adapting to what an opponent was doing.

 "The unscripted, unsupervised play that actually builds the spark."

Why It Matters Who Designed the Practice

It is not incidental, therefore, that Spain's head coach Luis de la Fuente spent years coaching Spain's youth teams before taking the senior job. Development coaching is where there is time to explore loosened activities, games and actions: time to let players search, fail, and find solutions that nobody scripted for them. The senior team inherits whatever emerges from that practice history.

This is also where knowledge about the environment finds its proper home. It belongs with the coach, at the point of design, and with coach and player together in reflection afterwards. A session can be built around exploiting the space behind a defensive line without the word "penetration" ever being spoken to the players. The name tells the coach which affordance the task constraints should keep making available for players. The task design carries a heavy load.

"Design practice such that the fixed structure of the game itself, by way of carefully manipulated task constraints and direct exploration, teaches players to perceive it." - Ian Renshaw, Coaching the Principles of Play

Yamal's comment about eschewing mechanisation and automatisation and the full-back's briefing are two responses to the same question: what does a player need to know before going out to perform? One answer lies in a dossier. The other emerges from a practice history that has built direct attunement to opponents who are themselves trying to adapt. In the Nations League game we get to watch which one holds up. Whatever happens, the lesson for coaches is the same. It's all in the practice design logic.

 "Read The Guardian's full interview with Lamine Yamal here" 

Read more from Ian on Substack, and explore more from The Constraints Collective at theconstraintscollective.com.

Read more from Ian on Substack, and explore more from The Constraints Collective at theconstraintscollective.com.
Link "Substack" 
Link "theconstraintscollective.com"