staying power

kestävyys endurance, the ability to continue at something for a long period of time.
2015, Daniel Taylor, Manchester City’s Sergio Agüero too good for Chelsea as Diego Costa labours (in The Guardian, 16 August 2015)http://www.theguardian.com/football/2015/aug/16/manchester-city-chelsea-premier-league-match-report

They have shown their staying power before and it would be daft to write them off but it must be disturbing, nonetheless, for Mourinho that his team are five points behind already and locked in a game of catch-up against the side that has just subjected them to a rare, old-fashioned beating.