Jamie Carragher and Gary Neville have found out just how tough the life of a Premier League referee is.
The punditry duo were put through their paces as part of Sky Sports's documentary The Referees - Onside with Carragher & Neville, taking part in a series of drills.
One of them saw Carragher and Neville performing shuttle runs as part of a bleep test, which was used to demonstrate the fitness required to be an official in the top flight.
Both seemed to struggle with the exercise and found themselves on the floor at the end of the drill as referees casually milled around them.