The air is thin, your lungs burn, and the ball seems to zoom past before you can react. That is the reality of playing football at altitude, and England's players are about to experience it firsthand when they face Mexico at the Estadio Azteca in Mexico City, which sits 2,240 metres (about 7,300 feet) above sea level. Altitude affects everything from how fast a player can run to how the ball moves through the air, and for teams not used to it, the challenge can be overwhelming.
Altitude simply means the height above sea level. As you go higher, the air pressure drops and the amount of oxygen available decreases. At the Azteca, the oxygen level is estimated to be 30 per cent lower than at sea level, according to Dr Juan Angel Hernandez, a sports medicine expert at Mexico's UNAM university. That lack of oxygen directly impacts aerobic performance – the kind of sustained running and exercise football demands. Dr Hernandez explains that a player's performance can decrease by up to 3.1 per cent when playing above 1,200 metres. That may not sound huge, but in a high-stakes World Cup knockout match, small margins can decide the game.
“How altitude affects football and why England's match at the Azteca is a unique challenge.”
Former Colombia international Franky Oviedo, who spent four years playing for Club America in Mexico City, describes the sensation vividly: "It's hard to breathe, your legs feel much heavier." The ball behaves differently too. Because the air is thinner, the ball travels faster and doesn't slow down as much. Oviedo says mid-range shots "don't follow the normal parabola, but go straight and travel incredibly fast." Players must adjust their touch and passing, as the ball can bounce off unexpectedly. Compounding the difficulty, pollution is a major issue in Mexico City. A notorious smog and strong diesel fumes fill the air, adding to the breathing strain. Oviedo calls the combination of altitude and pollution "awful, it suffocates you."
For UK readers, this explainer matters because England are playing Mexico in the World Cup round of 16 at the Azteca, and they have had no time to acclimatise. Thomas Tuchel's side prepared in the US, but altitude training typically takes weeks. Teams that live and train at altitude, like Mexico, have a significant advantage. Indeed, Mexico have lost only twice in 89 competitive games at the Azteca. The Guardian's Jacob Steinberg notes that England may need to adopt a defensive "low block" tactic to slow the game down and avoid being overwhelmed by Mexico's pace and physical edge. BBC pundits Rachel Corsie and Lucas Leiva have shared their own experiences of playing at altitude, warning that players can feel like they "can't breathe" and that recovery post-match is slower.
Q: How does altitude affect football performance? At altitude, the lower oxygen levels reduce aerobic capacity, meaning players tire more quickly. Running becomes harder, legs feel heavier, and performance can drop by about 3 per cent. Recovery after the game also takes longer because the body has fewer energy resources.
Q: Why does the ball behave differently at altitude? Thinner air creates less drag, so the ball travels faster and holds its speed longer. Shots that would normally dip or curve stay flatter and arrive quicker than players expect. This can catch defenders and goalkeepers off guard, making passing and shooting more unpredictable.
Q: Can teams prepare for altitude? Yes, but acclimatisation takes time – often weeks. Some athletes use iron supplements to boost red blood cell production and improve oxygen transport. Tactically, teams might slow the pace of the game, use a low defensive block, and rotate players more to manage fatigue. Short-term, however, there is no substitute for being used to the conditions.
What happens next: England face Mexico at the Azteca on Monday in the World Cup last 16. The outcome will show how well Thomas Tuchel's side adapted to altitude and pollution. If they progress, future opponents will have studied how England coped – and the impact of altitude will remain a defining theme of this World Cup.