Camilla made the bizarre comparison in a pre-recorded segment of BBC Radio 5 Live’s The Emma Barnett Show. The Duchess, whose first-ever guest edited radio show will air on Tuesday, said of Prince Charles: “He is probably the fittest man of his age I know. He’ll walk and walk and walk.
“He’s like a mountain goat, he leaves everybody miles behind.”
The Prince of Wales tested positive for COVID-19 in late March, a few days after he and the Duchess of Cornwall relocated to their Scottish home in Birkhall.
Prince Charles only suffered from a mild bout of coronavirus, and returned to work after seven days of self-isolation.
Camilla, who was also tested at a NHS hospital in Aberdeenshire, didn’t catch coronavirus and remained in quarantine for 14 days.
During the radio show, the Duchess is to speak about a wide range of topics.
Camilla confessed she got used to wearing jeans while she was far from the public eye in Birkhall and will miss the comfort of being dressed down as she resumes face-to-face engagements in London.
She said: “It will be very hard to get out of them again.
“I think you get into a sort of way of life, don’t you?”
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The Duchess will also explain how the lockdown changed her perception of the internet, as it helped her remaining in touch with her loved ones.
She said: “I’m ashamed to say that I really hated the internet.
“I didn’t understand it and I thought, ‘what’s the point of this?’
“Since lockdown, it’s been so brilliant because I’ve been able to communicate with family, my children, my friends.”
During the radio show, the Duchess will also reveal how she is looking forward to being able to hug her grandchildren again.
In mid-June, on her first face-to-face royal engagement in three months, Camilla revealed she had visited, in a socially-distanced manner, her grandchildren for the first time in months.
Camilla and Prince Charles have been the first members of the Royal Family to resume face-to-face visits.
After having visited staff at a Gloucestershire hospital, the royals returned to London to host Emmanuel Macron on the 80th anniversary of General Charles De Gaulle’s ‘Appel’.
Camilla’s mention of Prince Charles’s health comes as the Prince of Wales recorded a touching tribute to healthcare workers on the 72nd anniversary of the NHS.
In a pre-recorded video, the heir to the throne said: “After more than seven decades, that founding principle, though now familiar, is still a profoundly moving statement of our values – and it has never been more relevant than it is now.
“The current pandemic means that the NHS – and the entire country – has been through the most testing time in the service’s history.
“Our remarkably selfless nurses, doctors, paramedics and countless other staff have made costly sacrifices to provide treatment for more than a hundred thousand patients with coronavirus and thousands more who needed other care.
“And, in tribute to them, we have come together as a nation to thank them for their skill, professionalism and dedication.”
Prince Charles also spoke about the community spirit that emerged in Britain as the coronavirus pandemic started gripping the country.
He said: “Of course, our whole society has risen to this extraordinary challenge: from the farmers, fruit and vegetable pickers, delivery drivers and shop workers who provided our food, to the energy workers who kept the lights on, the transport staff and the public servants and business people who continued to provide vital services.
“Every new difficulty has been met with a new solution.
“Countless volunteers have come forward to help those in greatest need and, of course, all have had their part to play by heeding the official advice to help stop the spread of this cruel virus.
“This renewal of our community spirit has been a silver lining during this dark time.”