England goalkeeper Ben Foster has claimed that some of the training has been "brutal" ahead of this summer's World Cup.
Roy Hodgson asked his players to wear extra layers during a training camp in Portugal in an attempt to replicate the conditions which will await the players in Brazil, but Foster insists that the squad have approached the task well.
"When we were in Portugal we wore underarmour, T-shirts, zip-up tops and a wet top over that," the West Bromwich Albion goalkeeper revealed to reporters.
"Even at St George's Park last week we trained in the morning, lunch, slept for an hour and then did bike sessions in heat chambers to get ready.
"We've been doing half-hour sessions in there. It's brutal, really hard work. But no-one's grumbled or moaned about it, just got on with it."
Foster and his teammates are in Miami preparing for Wednesday's warm-up match with Ecuador.
