Pep Guardiola knows Raheem Sterling will cover more than 11 kilometres during a game and reach incredible speeds close to 37 kilometres per hour because of the tracking device he carries in his vest.
Ole Gunnar Solskjaer knows Harry Maguire will cover almost 10 kilometres across 90 minutes, performing at a 'high intensity' for about a third of it, with a highest speed of more than 35kmph.
These numbers are among the masses of information now compiled by sport scientists in the Premier League and analysed with the help of an increasingly sophisticated range of software.