Warming up before work used to mean eating your bacon buttie while it was still hot. But now, in an effort to cut down site injuries, Bouygues UK has stepped things up a gear.

It is 7am and a wintry sun is slowly rising above a strange scene. In an industrial yard, a group of 25 men are standing in two lines, all dressed in matching orange and blue. Without warning, as one, they start swinging their arms in a perfectly co-ordinated motion …

You may be forgiven for thinking you had inadvertently stumbled upon a boyband rehearsal, or perhaps a cult ritual. The truth, while marginally less exciting than that, is still fairly eyebrow-raising: the men are jumping, squatting, stretching and even buttock-squeezing all in the name of improving health and safety on site.

This unlikely scene is one of two daily morning warm-up sessions being trialled by Bouygues UK in this country: at the Broomfield Hospital project in Chelmsford, Essex, and here, on the North Middlesex University Hospital site in north London.

The French contractor first caught the fitness bug after a survey revealed that a disportionate amount of site injuries occur between 8am and 9am. At this time, workers’ muscles are cold, increasing the chance of them being torn or damaged.

Figuring that a bit of exercise first thing would solve this problem, two years ago Bouygues introduced 15-minute warm-ups for workers in France. The exercise regime focuses on the body parts most affected by work on a construction site, mainly the joints and back. It turned out to be a resounding success, resulting in a fall in site injuries and a roll-out of the scheme nationwide.

It may have gone down well in France, but then, Johnny Hallyday goes down well in France. The question is, how will site workers in Britain react?

The men here in London seem to be getting into the spirit. As they come to part four (back care), I grab a word with Bouygues UK project director at North Middlesex, Gerald Farque. He is evangelical about the scheme, and reckons all contractors should be doing it – a view reinforced by the fact that handling, lifting and carrying-related injuries account for 38% of all over-three-day absences in the UK construction industry.

“The benefits are there for everyone to see,” Farque says. “We put measures in place to stop crane accidents, or to protect ourselves from falling objects. Why not protect our men from musculoskeletal injuries?”

The lads on site are also positive. “It’s fun,” says José Marques, 29, from Portugal. “Every day it makes us laugh.”

He says it’s also improving his fitness: “It’s helped my aches, my muscle pain. I feel much fitter.” He says the exercises have especially helped the smokers on the project, with many of them now finding breathing while working much easier.

Vullent Hoxna, 32, from Albania, is also a fan. “I used to get pain in my back and shoulders, but this has really helped. I feel fitter; I feel I am getting younger,” he laughs.

On site today, the workforce comprises five or more nationalities, but it remains to be seen whether the scheme – which isn’t compulsory – could become the norm for a largely British workforce.

I used to get pain in my back and shoulders, but this has really helped. I feel I am getting younger!

Vullent Hoxna, 32

Phil Olding is managing director of New Leaf Health, the corporate health provider running the regime for Bouygues. He admits he is unsure how a site mainly made up of British workers would receive the warm-up sessions. “Culturally, this would be interesting,” he says. “I think it would need to become part of health and safety compliance for it to be sustainable.”

The test will come soon when British subcontractors start working at the North Middlesex site. Farque says he hopes they join in. “I think they’ll buy into it once they know what the benefits are,” he insists, looking slightly unconvinced. “After all, it’s no different to doing it on a football pitch, is it?”

But he does have reservations. “It’s a question of communication – we’ll have to explain exactly why we’re doing it.”

Meanwhile, the warm-up is reaching what looks like some kind of complicated climax. The men have formed a ring around the instructor. He hands out coloured batons, which are passed around the group until he blows his whistle. When you’re given the baton, you have to break the circle and run around it until you’re back in your spot. It’s like musical chairs as interpreted by a school games teacher. There is shouting and clapping, and a lot of laughing. Surely even the most cynical British site worker would have to giggle at this scene? You never know, the Bouygues warm-up might just catch on.

This article appeared in Building magazine under the title: Eat your heart out, Jane Fonda.

Going for the burn with bouygues. The Bouygues routine takes 15-20 minutes and is made up of six exercises