Harry Kane collapsed onto his knees and forced himself to be sick. Son Heung-min winced in pain as he too collapsed to the turf, causing his fellow Koreans watching on at the Seoul World Cup Stadium to gasp.
Welcome to pre-season training, Antonio Conte-style. Having put his Tottenham Hotspur players through 90 minutes of the usual rondos and a 10-versus-10 on a two-thirds size pitch, there was an unexpected twist.
With fitness coach Gian Piero Ventrone cracking the whip, the Spurs stars were made to run 42 lengths of the pitch at a pace that would be described as quicker than a jog.