Liverpool fans are feeling pretty confident ahead of the new season - and rightly so. The club's ambitions have been made clear with the signings of Naby Keita, Fabinho, Xherdan Shaqiri and goalkeeper Alisson Becker.
But the club will need superstar winger Mohamed Salah to be at full fitness if they wish to challenge Manchester City for the Premier League title. The Egyptian featured at this summer's World Cup, but only recently returned to training at Liverpool, where he was put through his paces in a lactic fitness test.
The test is simple - jog a lap of the pitch before having a blood sample taken, if the level of lactic acid in the blood exceeds a certain limit, the player is out of the test.