“Is a fighter”: Expert reveals what gives King Charles strength after cancer diagnosis. “He's a fighter and has inner steel," royal author Robert Hardman tells the weekly magazine.

Charles pulls the strings in state affairs behind the scenes and works hand in hand with the government, it is said. A positive attitude and strong resilience can work with any species of illness will not be a disadvantage, a source close to the royal household says. Prince Harry confirms his father's physical fitness in his book Spare.