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It’s not just England’s footballers who are warming-up for this summer’s World Cup in Brazil.

Referee Howard Webb is hard at work getting himself in to top condition for the tournament too.

For the last two weeks, he’s been training in a chamber heated to 40C just to get ready for football’s biggest event.

Scientists at Sheffield Hallam University believe Webb will lose 10 pints of sweat during every World Cup match he takes charge of.