The Liverpool squad undertook lactate testing as they kicked off their pre-season programme on the first day in Austria on Monday.
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