There are two options when you finish a game to completion: You can either walk away forever with the immense satisfaction of a job well done or you immediately go back to the beginning, ramp up the difficulty and start all over again.
There are no prizes for guessing which one Pep Guardiola would do. The Manchester City boss could retire from football today and he would go down as the greatest manager of his generation and perhaps of all time.
Not only has he changed how the game is played from the grandest stage all the way down to the grottiest park pitches but he has won all there is to win in three different countries.
Guardiola's latest and possibly grandest achievement came just a couple of weeks ago when he guided his City side, which many had written off by mid-February, to a remarkable Treble triumph.