The retired royal regularly takes his horses out for a spin in the Windsor Castle grounds.
Both the Duke and the Queen are huge fans of animals and Her Majesty is often seen riding her horses solo.
The Queen, and husband Philip, have passed down their love of riding to their children and grandchildren.
Princess Anne is also regularly seen riding her horses around Windsor, and her daughter Zara Tindall won a silver medal in Equestrian at the 2012 Olympic Games.
Prince William and Harry are also keen riders, with the pair taking part in polo matches.