Prince George is doing horse-riding lessons on aunt Zara Tindall’s Shetland pony.

Prince William and Kate Middleton’s son just turned 6 years old on Monday. Interestingly, he has been having horse-riding lessons in Windsor since he was 4.

The Duke and Duchess of Cambridge are reportedly keen on having their son take up the hobby. They asked Olympic equestrian Zara to loan them a smaller pony for Prince George to get started on. Zara didn’t disappoint the couple.

“William and Kate were really keen to get George riding – it’s something all the royals do and the whole family adore animals. But obviously he’s only small so they didn’t want to put him on a big horse,” a source told Hello!

“They asked Zara if they could use one of her Shetland ponies and he’s been learning to ride on one of those.”

Prince William was a keen rider when he was a child. He even owned his very own Shetland pony named Smokey when he was 4.

The Cambridges are very close to the Tindalls. A few months ago, Prince George and Zara were photographed hugging and giving each other a high five.

Also, an insider revealed that Prince George’s favorite uncle is actually Zara’s husband, Mike Tindall, and not Prince Harry.

“He hits it off best with those people who are most comfortable in their own skin,” the source said of the third-in-line to the throne.

“His favourite uncle is Mike Tindal l, because he larks about and never takes himself too seriously.”

Tindall said in a past interview that the royal kids are very close. He was hoping that they would be able to maintain their bond and grow up as good friends.

Aside from horse-riding lessons, Prince George is reportedly learning to play tennis with champion Roger Federer, People reported. He also spends much of his time outside gardening with his mom, Middleton.

The Duchess of Cambridge said earlier that she wants her kids to experience the joy of being outside because it encourages creativity and makes a huge difference to their physical and mental well-being.

Prince William and Prince George
Pictured: Prince William and Prince George at a children's party for Military families during the Royal Tour of Canada on Sept. 29, 2016 in Victoria, Canada. Getty Images/Chris Jackson