Kate Middleton has little-known hobby that she does in the dark - but William thinks she's 'crazy'

Princess Kate has a 'crazy' hobby that Prince William just cannot get his head around.

The Princess of Wales, who is currently receiving chemotherapy after receiving a cancer diagnosis, once opened up about her fascinating pastime during an appearance on Mike Tindall's podcast, The Good, The Bad and The Rugby. Catherine gushed about her love of sports, as she mentioned one particular activity that William calls her ‘crazy’ for.

Despite the future King's thoughts on the adventurous hobby, the Princess revealed she 'loves it' so much she's willing to do it in the dark and cold. She told Mike, married to Zara Tindall since 2011: "I can always remember being physical, using our bodies, whether it's walking, climbing the Lake District, in Scotland [or] swimming from a young age. [My parents] always encouraged us to be physically active and sporty, and they always encouraged us into doing team sports and trying things."

Catherine, Princess of Wales takes part in drills on the pitch during her visit to Maidenhead Rugby Club
Catherine, Princess of Wales is known to love sports -Credit:Getty Images
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Kate Middleton, revealed she has a little-known adventurous hobby that she does in the dark -Credit:Getty Images

She then shared her love of cold water swimming, which sees the Princess enjoy a chilly dip in the great outdoors. Kate enthused: "Cold swimming - the colder, the better. I absolutely love it. Slightly to the point where William's [saying] 'You're crazy' and it's dark and it's raining. I will go and seek out cold water. I love it."

The Princess also has a Professional Association of Diving Instructors (PADI) Advanced Open Water Diver qualification, which means she can dive to a depth of up to 98 feet (30 metres).

Prince William, Prince of Wales and Catherine, Princess of Wales take part in a spin class during a visit to Aberavon Leisure and Fitness Centre in Port Talbot
Prince William can't get behind Kate's 'crazy' hobby -Credit:Getty Images
William has been supporting Kate through her cancer diagnosis
William has been supporting Kate through her cancer diagnosis -Credit:PA

It’s a passion shared by her husband, Prince William, who has also had his scuba qualifications for some time – and is the president of the British Sub-Aqua Club.

A spokesperson for Kate confirmed to the Telegraph: "Diving is something the Duchess very much enjoys, and the Duke of Cambridge, who is of course president of the BSAC, has said in the past that he is hopeful his children will become interested in the sport."

The Princess had to complete five dives, including a deep dive and an underwater navigation dive, to pass the complex course. The qualification also teaches you how to cope with physiological effects of deeper scuba diving, as well as how to handle equipment including a compass and a dive knife, which would be used in emergencies such as becoming entangled in fishing nets.

In a video statement released in March, Catherine said it was a "huge shock" to be diagnosed with cancer. But in a positive message to the public she said: "I am well and getting stronger every day."

"Tests after the operation found cancer had been present. My medical team therefore advised that I should undergo a course of preventative chemotherapy and I am now in the early stages of that treatment," said the princess.