When a large part of your job consists of energetic stage performances and fleeing screaming fans, it’s essential you stay in shape. To that end, global megastars One Direction have enlisted the services of celebrity PT Mark Jarvis and Jordan Fitness to keep in peak condition on their current world tour.

Known to be fans of functional fitness, Louis, Niall, Harry and Liam will be put through their paces as Jarvis utilises the full range of Jordan Fitness functional kit. Ideal for a speedy workout in the midst of a packed schedule, the band will have use of Kettlebells, Battle Ropes, PowerWave Crosstrainers, Slam Balls and Powerbands.

“You don't need a gym full of equipment to train correctly. Jordan Fitness has an ideal range of functional equipment that does just that,” said Jarvis, who has previously trained Keira Knightley and Nicolas Cage.

"The Jordan equipment that I train One Direction and 5 Seconds of Summer on is ideal to travel with and can be used in a wide variety of workouts. I can train the guys in a dressing room, backstage or in a car park. Anywhere there's room to set up a group or one-on-one session.”