There's no doubt that Meghan Markle's trim figure - even during much of her pregnancy - has been the envy of many.
But while Duchess of Sussex, 37, is famously a fan of yoga, and has been reported to have got husband Prince Harry into clean eating, one fitness expert believes she works harder than that to stay in shape.
The new royal mum - who gave birth to baby Archie earlier this month - is said to be a fan of a tough workout that uses a strength-building machine inspired by a Pilates reformer bed which incorporates weights-based exercises.
Sebastien Lagree, who is nicknamed the 'torturer to the stars' after founding the celebrity favourite Studio Lagree, has revealed that his classes are behind Meghan's toned body.
Sessions involve participants using a 'megaformer bed' to do a series of slow, multi-targeting exercises.
The French-born trainer - who counts Michelle Obama, Ashley Graham, the Kardashians and Victoria's Secret models among attendees - admitted he didn't know he had a royal fan until Meghan told Women's Health in 2017 that she visited his London studio.
At the time, the then-actress said: "'It is hands down the best thing you could do for your body.
"You keep coming back for several reasons: first off, your body changes immediately... give it two classes and you will see a difference; the people in class are cool, unpretentious, and motivating."
Meghan's hair styles
Meghan's hair styles
The Duchess of Sussex attends an Investiture for Michael McHugo the founder of 'Education for All', where he received an MBE, during their visit to the original 'Education For All' boarding house in Asni Town, Atlas Mountains on the second day of her tour of Morocco with the Duke of Sussex.
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The Duchess of Sussex leaves following a visit to Canada House in London for a Commonwealth Day youth event celebrating the diverse community of young Canadians living in London and around the UK.
The Duchess of Sussex arriving to join a panel to celebrate International Women's Day at King's College London. Picture credit should read: Doug Peters/EMPICS
The Duchess of Sussex attends a reception at Buckingham Palace in London to mark the fiftieth anniversary of the investiture of the Prince of Wales.
The Duke and Duchess of Sussex greet Princess Lalla Meryem of Morocco (second left) and Princess Lalla Hasna of Morocco, during an audience with the King Mohammed VI of Morocco at his residence in Rabat, on the third day of their tour of Morocco.
The Duke and Duchess of Sussex during a visit to a social entrepreneurs event and market at the Andalusian Gardens in Rabat on the third day of their tour of Morocco.
The Duchess of Sussex arrives for a cooking school demonstration at Villa des Ambassadors in Rabat on the third day of her tour of Morocco.
The Duke and Duchess of Sussex arrive at the Moroccan Royal Federation of Equestrian Sports in Rabat on the third day of their tour of Morocco.
The Duchess of Sussex during a reception hosted by the British Ambassador to Morocco at the British Residence in Rabat on the second day of her tour of Morocco with the Duke of Sussex.
The Duchess of Sussex during their visit to the 'Education For All' boarding house in Asni Town, Atlas Mountains on the second day of their tour of Morocco.
The Duchess of Sussex during a Henna ceremony as they visit the 'Education For All' boarding house in Asni Town, Atlas Mountains on the second day of their tour of Morocco.
The Duchess of Sussex arrives at a gala performance of The Wider Earth at the Natural History Museum in London.
The Duchess of Sussex arrives to meet Crown Prince Moulay Hassan at a Royal Residence in Rabat as she starts her tour of Morocco.
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Sebastien, who has opened over 400 studios worldwide, revealed that he hopes the mum-of-one will continue to use his workout even after Archie's birth.
"I suspect Meghan does it about three times a week," he told Femail. "She looks like she's very committed."
He continued: "You don't bulk up; it's about strengthening and tightening and sculpting your body, which you can tell Meghan has done.
"I had people coming up to me saying they want to look like Meghan.
"Meghan said you only need to go to the class a couple of times to see a difference, and I think that's part of the appeal."
The trainer said his class is ideal for new mums and can also be done by women during pregnancy.