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It’s more for women who want to drop a dress size or two, gain some lean definition and get much fitter and healthier at the same time.” One of the first non-model women Roberts tested it out on was his PA.

After completing all three weeks of the programme, she dropped from a size 10 to an eight, without changing her diet.

His client book includes not only actresses and actors, but singing legends and members of four different royal families.

He has contracts with major Hollywood film studios and top model agencies such as Tess Management in London, which represents Rachel Weisz, Georgia May Jagger and Elizabeth Hurley among others.

“It isn’t designed for someone who is very overweight or above a size 14 really,” he says.

“It’s not a weight-loss programme as such, although it will obviously help you lose weight.“But after two weeks the intensity goes up so it becomes a tough interval training circuit.” Signature moves on the plan, which is presented in the form of an ebook containing video demonstrations, include the Supergirl, a core exercise that involves kneeling on all fours and extending the opposite arm and leg.In the advanced version the manoeuvre is carried out on your toes.Then there is the two-legged hip thrust, a glute and hamstring firming exercise where you lie on your back with knees bent then push the hips up towards the ceiling. The exercises don’t look too difficult but it’s all about the tempo.When you slow them down as prescribed, you soon feel the burn.“They all have to keep their waists narrow with oblique definition rather than a six-pack, which means incorporating lots of twisting exercises,” says Roberts.