One Direction have been ordered to get fit by their record label in the build up to the band's concerts in America.
The Kiss You hitmakers have been put on a strict fitness regime and healthy eating plan by Columbia records in a bid to whip them into shape before the North American leg of their Take Me Home tour, which kicks off in Mexico City this weekend.
Harry Styles and co. finished the UK and European part of the tour last month and will be back in London - at Wembley - this time next year; tickets available here.
An insider told the Daily Mirror: "It's important the lads are in the best possible shape for these dates. Bosses don't want half measures.
"The boys spend a lot of time travelling and there can be a tendency to eat junk food and play lots of video games.
The heartthrobs are being put to the test by personal trainers Mark Jarvis and Jimmy Wallhead, who are determined to bulk up the boys and define their muscles using a combination of circuit training, low-carb diets and boxing.
The source added: "But, thanks to [trainers] Mark and Jimmy's new regime, they've been working out lots more. Harry [Styles] has really bulked up his arms, and Liam [Payne] has a sturdy set of abs.
"Niall [Horan], Louis [Tomlinson] and Zayn [Malik] have been working out with separate trainers and they're getting into it, too."