England play in Mexico City on Sunday, 2,240m above sea level, and research shows high-speed running is harder and recovery is slowerEngland have made it into the last 16 of the World Cup, and will face Mexico on Sunday (1am Monday BST). But they will also be up against another opponent: altitude.We take a look at how playing in the Estadio Azteca in Mexico City, 2,240m above sea level, might affect their performance. Continue reading...