Fitness
There is an opinion that exists where some believe that the referee just moves around the centre circle and generally strolls around the park. However that is be no means accurate, and this section will dispel that myth.
The reality is that at the top tier of performance, tests have shown that in a match a central midfield player (who would be considered the most dynamic player on the pitch) will cover 10km during the course of a game. While a referee will cover (on average) 14km, of which 3km will be run backwards!!
Therefore they should focus on their fitness levels as much as a player.
Fitness Tests: There are fitness tests at every level of football. And to ensure the referee is competent to officiate at that level they must pass the test. The test that top tier referee's are expected to pass is outlined here. Read On
Fitness Training: Player's are not the only individuals within football that must train to maintain and enhance their physical performance. The referee's have certain sessions and exercises they can undertake as well. View Sessions