Small groups took turns to perform the drill – which measures endurance levels with a series of runs at increasing speeds – at the Reds' pre-season training camp on the outskirts of Salzburg.
That included summer signing Ibrahima Konate, plus the likes of Trent Alexander-Arnold, Joe Gomez, Joel Matip and Virgil van Dijk after injury.
See how they fared with the collection of images below...
Photos by John Powell
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