One Direction boys have reportedly been instructed by their US label bosses to tone their bodies ahead of the American leg of their tour.
The Boy band is taking professional help from mixed martial artist trainers Mark Jarvis and Jimmy Wallhead to get in perfect shape, reported Daily mirror.
One Direction stars are taking boxing classes, circuit training and low-carb diet on the advise of their new trainers.
"It's important for the boys to be in the best shape physically possible for these dates. Bosses don't want half measures, and as the boys spend a lot of time travelling, there can be a tendency to eat junk food and play lots of video games," a source said.
"But thanks to Mark and Jimmy's new regime, they've been working out lots more. Harry has really bulked up his arms, and Liam has a sturdy set of abs. Niall, Louis and Zayn have been working out with separate trainers, but they're getting into it, too," the source added.
The boys are currently enjoying a couple of weeks off, but they are all set to kick off the North American leg of their tour this weekend.
