A referee is always expected to be in the right place at the right time when a World Cup match hinges on a split-second decision in the final moments, a task made no easier by everything from Miami’s humidity to the breath-sapping altitude of Mexico City.

While fans focus on players chasing goals, referees run just as hard, typically covering 12 to 13 kilometers per match according to FIFA – a distance comparable to many outfield players.

This reality has changed how FIFA prepares its officials for the biggest sporting event. FIFA told Reuters: 'Preparation for the 2026 World Cup referees began nearly four years ago.'

The preparation has been similar to that of elite athletes. Officials have undergone repeated physical assessments, with training intensified sharply in the six months before the tournament.

The challenge goes beyond distance. A referee might spend a match battling humidity in Miami, and another chasing play at over 2,200 meters above sea level in Mexico City, with long flights, time zone changes, and extreme temperatures creating demands akin to endurance events.

FIFA said lessons from the 2025 Club World Cup in the United States were invaluable in preparing officials for 'heat, humidity, and also different time zones.'

Officials train for endurance, strength, speed, agility, and acceleration, often through match-like simulations, while performance experts scrutinize every sprint, heartbeat, and recovery cycle. The goal is simple: to reach every decisive moment before controversy strikes.

Research has linked fatigue to poor positioning, narrower viewing angles, and slower reactions – all elements that contribute to the kind of errors that can be etched in World Cup memory forever. That is why FIFA now treats referees exactly like players.

The World Cup officiating team consists of 52 referees, 88 assistant referees, and 30 video match officials from 50 member associations. They are based in Miami, living in an environment built around training, nutrition, recovery, and technical preparation, with 12 medical specialists, 10 physical therapists, and a chef trained in sports nutrition.

GPS devices monitor workload, heart rate sensors measure physical effort, and blood lactate testing helps staff determine how well the body is adapting. Training loads are then adjusted with scientific precision. FIFA said: 'We use data tracking devices at the same level as players.'

The three days leading up to matches include match simulation sessions, along with short, intense acceleration and speed drills. After that, recovery takes center stage.

FIFA said: 'The two days after matches are dedicated to active recovery training, along with massage and cryotherapy sessions, which help achieve faster and more effective recovery.'

FIFA also introduced hydration supplements and redesigned training schedules to limit direct sun exposure.

However, studies have found that high-intensity running can account for more than a third of their movement during elite matches, with heart rates often reaching 80% to 100% of maximum levels.

Throughout, officials track player movements, spot potential fouls, anticipate tactical patterns, and seek the best possible viewing angle – often while sprinting.

Despite the preparation, injuries remain a risk. In the USA's 2-0 group-stage win over Australia, German referee Felix Zwayer went down with a muscle cramp in stoppage time, requiring help from players of both teams and an assistant referee to stretch his leg so he could finish the match.

Advertisement

Advertisement