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..
All these are happening at Liverpool’s pre-season training camp on the outskirts of Salzburg.
Players at Liverpool included summer signing Ibrahima Konate.
Others include the likes of Trent Alexander-Arnold, Joe Gomez, Joel Matip and Virgil van Dijk after injury.
Below is the collection of images