The Italian referees had to pass their fitness tests at the beginning of the season. Someone filmed it and published it on YouTube accompanied with some relaxing music. I love it to see other referees do their training sessions.
Check out the three video’s below about the referee training session.
Video one contains the warming-up laps.
https://www.youtube.com/watch?v=ILcDl887HgE
Video two contains footage of the sprint tests.
Video three contains something that looks like a shuttle-run (beep) test. And a new series of sprinting.