England refused against the altitude but instead played with it.
If you, like me, stayed up to watch England beat Mexico at the Azteca on Sunday, it was well worth the alarm.
Most of the post-match analysis has landed on the same verdict: altitude wasn't really a factor. That is only true if you stop at the scoreline. England won 3-2, at 2,240 metres, in a stadium where Mexico had never lost a World Cup match. Job done, altitude survived, move on.
I was asked by The Times to look one layer down, at the physical data and what I saw was the opposite: the conditions did not beat England. England beat the conditions, by refusing to play the game the altitude was asking for. This is the longer version of that argument, with the numbers I could not fit into a match report.
Read the headline stats cold and you get the survival story. England kept 33.2% of the ball, their lowest possession in a World Cup match since records began in 1966 (Opta). They made 49 clearances, their most since 1990. Late on, with the game stretched into 11 minutes of added time, Mexico had completed almost 400 passes to England's 230 and taken more than 65% of the ball.
But buried in FIFA's tracking data is a single number that turns that story inside out.
The number that does not fit
Here is what happened to England's running, measured against their tournament baseline coming into the game:
Total distance: down 10.3% per minute
Moderate running (15 to 20 km/h): down 21.5%
High-speed running (20 to 25 km/h): down 41.3%
Sprint distance (25+ km/h): down 50.5%
Sprint count: down 40.5%
Notice the shape of that. The drop gets steeper the faster you go. The higher the oxygen cost of the recovery of the action, the deeper the cut. That is not random fatigue spreading through a tired team. That is a gradient, and gradients are made by systems, not by exhaustion.
Now the number that does not fit the "they collapsed" narrative:
Maximum top speed: up 3.2%, from 34.7 to 35.8 km/h.
England's single fastest moment of the entire tournament came in the game where they ran the least. You do not do that if altitude has emptied your legs. A team that has hit a physiological wall cannot suddenly find a new personal best at the top end. The ceiling was intact. What changed was how often England were willing to touch it.
Why the ceiling held while the volume fell
This is where firsthand experience matters more than a spreadsheet. A few years ago I stood at the velodrome in Aguascalientes, at altitude, while Jeffrey Hoogland attacked the kilometre world record. Altitude and a single flat-out effort are not enemies. Thinner air means less aerodynamic drag, and for one explosive effort that can actually help. The problem altitude creates is not the first sprint. It is the second, and the third, and the recovery in between.
The physiology is well described. Around 2,250 metres you lose roughly 13% of your aerobic capacity, because there is simply less oxygen dissolved in the blood to fuel sustained, repeated, high-intensity work (Townsend et al., 2017, is the cleanest frame I know for this). Your anaerobic capacity, the system that powers a single short burst, is left largely intact. So at altitude the shape of what a footballer can do changes. The one-off top-speed run survives. The ability to produce that run repeatedly, and to keep circulating the ball at pace for ninety minutes, does not.
England's data is that physiology written onto a football pitch. Top speed preserved. Everything that requires you to do it again and again, suppressed.
The reduction has a shape, and the shape is the argument
If altitude had simply drained England, their running would have fallen roughly evenly across the board. It did not. Line the cuts up by speed and something deliberate appears:
Zone 1, 0 to 7 km/h: down 2.9%
Zone 2, 7 to 15 km/h: down 7.2%
Zone 3, 15 to 20 km/h: down 21.5%
Zone 4, 20 to 25 km/h: down 41.3%
Zone 5, 25+ km/h: down 50.5%
That is a clean, ordered gradient. The more oxygen an action costs, the more England cut it, and the cheapest work, the walking and jogging that holds defensive shape, was left almost fully intact. A tired team fades everywhere at once. A team playing with a constraint cuts from the top down and protects its structure. This is the second kind, and the ordering is too tidy to be an accident.
Now put Mexico's numbers next to it, because they are the mirror image. Mexico raised their output, but the gradient runs the opposite way:
Zone 1: up 34.3%
Zone 2: up 32.2%
Zone 3: up 15%
Zone 4: up 6.6%
Zone 5: down 1.8%
Mexico added a huge amount of low-intensity distance and almost nothing at the top end. They did more of their own game, more circulation, more territory, more of the sustained possession they are adapted for and at home in. They doubled down.
And here is the fact that binds the two teams together. Neither of them could add high-speed distance. England lost half of theirs, Mexico's went slightly backwards. Mexico were altitude-adapted, playing their fourth game of the tournament at this venue, and they still could not raise their Zone 5 output. So the real tax of 2,240 metres, the non-negotiable one, was repeated high-speed running, and it fell on both sides equally. The game was never decided by who could beat that tax. It was decided by what each side did with a fixed sprint budget.
That is the whole difference. Mexico spent theirs trying to bury England in low-intensity volume. England refused the volume game entirely, protected their shape and their one surviving weapon, and rationed it.
The rationing shows up everywhere else in the data. Their passes per minute fell 56%, but their possession fell only 46%, which means that even with the ball at their feet, England passed it less: fewer touches, more direct progression, less of the circulation that burns oxygen. Declan Rice carrying the ball 60 yards himself to launch the first goal is that idea in a single action. And while the running metrics dropped, a specific cluster climbed:
Defensive pressures applied: up 15.6%, from 210 to 243 per match
Goalkeeper involvements: up 48%, from 47 to 69
Goalkeeper line breaks: doubled, from 11.5 to 23 per match
Read those together and the plan is unmistakable. England took the oxygen out of midfield and put it into two places altitude does not punish: moving the ball forward through the air, and defending their own box. Pickford broke the goalkeeper's line at twice his normal rate, skipping the aerobic phase of the game rather than trying to pass through it. And the sprints that survived were saved for transition, the one moment a single explosive effort can score. Both Bellingham goals, 98 seconds apart, came from exactly that: winning the ball and breaking at speed, not from patient build-up.
England did not lose the ability to play their game. They decided their game was the wrong game for the altitude, and built a different one out of the parts that still worked.
They did not fight altitude on aerobic terms. They refused the game altitude wanted them to play, and they built a different one out of the parts that still worked at 2,240 metres.
The top-speed number is the proof. A team that hit a wall runs slower everywhere. A team that made a choice runs faster at the top and simply chooses to go there less often. England were the second kind.
The honest caveats, because a practitioner audience deserves them
I am not going to hand you a clean story and pretend the confounds do not exist. There are two, and naming them makes the argument stronger, not weaker.
First, the red card. Jarell Quansah was sent off in the 54th minute, so England played roughly the second half a man down. Losing one of eleven outfield players mechanically reduces team output by close to 9% over that period, so some of the total-distance and volume drop is arithmetic, not physiology. That is real, and it means the raw whole-match deltas overstate the pure altitude effect.
But the caveat cannot touch the central finding, and this is the important part. A man down reduces output roughly evenly: one fewer player runs in every zone, at every speed. It cannot manufacture a steep, ordered gradient that gets worse the faster you go. The red card would flatten England's numbers uniformly. It could never produce a 2.9% cut at walking pace and a 50.5% cut at sprint pace in a clean ascending line. That shape is not a headcount effect. It is a selective, intensity-dependent reallocation, which is exactly what a plan looks like. Two smaller points survive too: the possession swing began before the red card, with England near-even at 51.4% in the opening exchanges and Mexico's grip tightening while it was still eleven against eleven, and the top-speed increase is not a game-state artefact at all, because you do not run faster because you are a man down.
Second, game state. England led from the 38th minute and spent much of the match protecting an advantage. Teams protecting a lead run less partly because they choose to. So the honest version is not "altitude alone caused all of this." It is "altitude set the constraints, and England's response to those constraints, plus the game state, produced the pattern." The interesting coaching question is the response, and the response is what the data lets us see.
One footnote on the Mexico comparison. Mexico ran 28.8% more per minute than their own tournament baseline and still lost, which is a striking line. But three of their four previous games were also at the Azteca, so their baseline is partly altitude-adapted players at altitude. Treat the direction of that number as sound and the exact magnitude with care.
What I told The Times
When The Times asked me to make sense of the performance, I kept coming back to the same idea: this was a coaching decision dressed up as a physiological one. What I said to them was this.
"In the coaching landscape, it is dogma to say that we do not change who we are, we never change our principles and, no matter what, we will continue playing the same way. In any sport, this approach only gets you so far and eventually you will be figured out. I have always thought the best ability in coaching is adaptability, and at least from a physiological perspective, that is what Tuchel and England did.
"England priced oxygen into their game plan. In the end, it wasn't the conditions beating England. It was England working with the altitude by refusing to play an aerobic game. They spent possession, distance and pass volume to buy the only currencies that mattered at 2,240m, using their energy when they needed it rather than when they wanted to."
That last line is the one that matters, and the data is what lets me stand behind it. Using your energy when you need it rather than when you want to is not a phrase about fitness. It is a phrase about discipline, and about being willing to look worse in order to be right.
What this means beyond one football match
The transferable idea here has nothing to do with football and everything to do with performance under a hard constraint.
When the environment takes something away from you, the instinct is to try harder at the thing you have lost. England's aerobic game was taken away by the air. The losing move is to keep trying to pass your way through midfield anyway, burning an oxygen budget you do not have, and arriving at minute 70 with nothing left. The winning move is to work out precisely which of your capabilities the constraint has left intact, and to reorganise the entire performance around those.
That is a decision made before kick-off, not a reaction discovered at half-time. You can see it in England's data from the first whistle. The rationing was in place from minute one. Somebody sat in a room, looked at the physiology, and decided which currencies to spend and which to hoard. That is the actual work, and it is the same work whether the constraint is thin air, a tight budget, a missing key person, or a market that has moved against you.
Saturday, England play Norway in Miami, at sea level. The oxygen budget comes back. Their baseline profile, around 1,178 metres per minute, five sprints, 555 passes, goes back on the shelf. The question stops being "can they win ugly under a constraint" and becomes "can they win on their own terms against a good side." Different test entirely. But the Azteca answered a more interesting question first: when the environment dictates the game, can you have the discipline to play a worse-looking one on purpose, and be right?
England were right.
