The Duke of Cambridge will take listeners on a walk down memory lane when he joins forces with Apple Fitness+ for a special festive episode of its "Time To Walk" audio series.

William, 39, is hoping to encourage people to take a break and go for a walk for their mental wellbeing over the Christmas period. CNN understands the duke is a fan of the series and approached Apple about the project.

William opens the episode contemplating his father's love of walking and that while growing up, Charles "used to try and force Harry and I out of the house the whole time" adding that "we weren't really having any of it."

"But now, as you get older, you appreciate it a lot more and you see it for what it is," William says.

The royal is the latest star to record a walk-and-talk for the series, available on Apple Watch with a Fitness+ subscription.

Each episode, which ranges between 25 and 40 minutes in length, is designed to be an immersive experience. Featured guests take a stroll in a meaningful location and reflect on life's lessons while sharing memories and experiences through stories, photos and songs.