Luis Enrique has competed in the New York Marathon, the Frankfurt Ironman, a 10-hour triathlon, and a 255km trek through the Moroccan desert with a 10kg rucksack. The former Barcelona manager is one for long-haul tests.
But at Chelsea he might have to learn how to sprint. The club's managerial record under Roman Abramovich is one of short bursts of success followed by a departure, a reset, and more success.
Depending on which Enrique they get, that could either be the worst case scenario or his ideal.
There are two tales in the Asturian's managerial career.