One Direction Get Fighting Fit For Tour!

1D start gruelling fitness regime with mixed martial arts trainers…

Tuesday, June 4, 2013 - 16:13

One Directionare set to muscle up ahead of the American leg of their tour.

According to The Mirror, the Brit boys have been put on a strict fitness reigime to bulk up their muscles and tone up their six packs to give their fans even more to swoon over.

The X Factor group kick off their American gigs this weekend, and their US record label bosses want them looking the best they can.

1D are said to have been receiving the help of professional MMA trainers Mark Jarvis and Jimmy Wallhea, who have been pushing the boys through boxing classes, circuit training and strict, low-carb diets.

A source told the tabloid that 19-year-old Liam Payne has been drinking protein shakes to help build up even more muscle and has developed “… a sturdy set of abs.”

However, bandmate Harry Styles isn’t far behind and has allegedly “bulked up his arms”.

We look forward to seeing the results, boys!

SEE 101 OF ONE DIRECTION’S MOST FAMOUS LOOKS HERE!

CHECK OUT PICS OF ONE DIRECTION IN MTV'S GALLERY HERE!