His wife, Camilla, Duchess of Cornwall, who turned 73 on Friday, has revealed some of his fitness secrets.
The Duchess spoke about their workout habits in a new interview this week.
Appearing on BBC Radio 5’s The Emma Barnett Show, Camilla said of her husband: “He is probably the fittest man of his age I know.”
The comment may have come as a surprise after Prince Charles suffered with the coronavirus earlier this year.
He has since recovered well – and perhaps it’s all down to his regular fitness routine.
The royal does a 12-minute Royal Canadian Air Force exercise plan every day.
The plan doesn’t require any equipment and simply includes stretching, planks, arm circles, sit-ups, back extensions, push-ups and running on the spot.
It was developed by Dr Bill Oban in the late 1950s and is known as the 5BX Plan (Five Basic Exercises).
Dame Helen Mirren, 74 is also said to swear by BX Plans to stay fit.
The basic exercises are designed to keep you moving no matter what your fitness level – which means it can work for any age.
“It is the exercise I have done off and on my whole life,” Mirren has previously said in interviews.
“It just very gently gets you fit. Two weeks of doing it and you think: ‘Yeah, I could go to the gym now.’”
She also revealed that it’s a good way to kickstart a fitness routine if you’ve been slacking.
“If I decide, it’s time Helen, you’ve got to start again – I always start with the Air Force exercises,” she said in an interview with Kate Garraway.
“It absolutely works. Do it five times a week for two weeks and you’ll feel the difference.”
The easy exercises can be found online, and downloadable books are available to take you through the routines.
Ian Walton, publisher of the BX Plans for men and women said: “I had used the 5BX Plan in my younger days and as I passed 60, I decided it was time to get fit again.
“I published the books because I believe it is the best fitness plan ever devised; so simple.”
In the interview Camilla also added that she’s been taking up her own fitness routine in the lockdown.
The Duchess admitted that she has been having virtual Silver Swans ballet classes on Zoom.
However, she added that she hasn’t been able to convince her husband to do them with her.
“I did not get him doing a plié, but he is a very, very fit man. But he is not doing ballet,” she quipped.