Tottenham's young team aren't tiring - in fact, they've actually increased the amount of ground they're covering in Premier League games since the turn of the year.
Mauricio Pochettino's tireless side have been described as "animals" by Watford boss Quique Sanchez Flores, while Swansea assistant Alan Curtis praised their relentless attacking in the comeback win over his club last month.
And any concerns that Spurs would be unable to sustain their high-pressing, high-energy game through the second half of the season appear unfounded.
In fact, Spurs - whose starting line-up is the youngest in the Premier League on average - have increased their work-rate in 2016.
In Tottenham's 10 Premier League games since the start of January, the players are covering an extra 2.71km per game, on average.
That was highlighted in the north London derby on Saturday, when Spurs covered 115.1km to Arsenal's 105.4km.
As a result, Spurs are closing in on hard-working Bournemouth, who have currently covered the most ground this season.
Bournemouth players have run 38.4km further than Tottenham players this season - but Spurs have covered 20.2km more than the Cherries in 2016.
All that running is paying off for Spurs, too. They have taken 20 points from a possible 30 in 2016, moving into second place in the Premier League, five points off leaders Leicester City.