Kate Middleton takes up hobby that Prince William 'cannot get his head around'

Kate Middleton has an unusual hobby which Prince William cannot get his head around – and she even does it in pitch black. The 42-year-old mum-of-three, who has battled cancer this year, 42, enjoys a range of sports, from hockey and netball, to tennis or skiing.

Kat, is known for her love to keep active - but there's one hobby which Prince William, also 42, cannot get his head around. There is one activity that the Princess ''absolutely loves'' and Aston Villa FC fan William, also 42, thinks his wife is ''crazy''.

Kate opened up about her hobby, which she also does in the dark, during an appearance on the podcast, The Good, The Bad and The Rugby, hosted by Mike Tindall, James Haskell and Alex Payne. "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," Kate said.

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''[My parents] always encouraged us to be physically active and sporty and they always encouraged us into doing team sports and trying things." The 42-year-old raved: ''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!" It comes after William had his scuba qualifications confirmed by the Kensington Palace - with the heir to the throne acting as president of the British Sub-Aqua Club.

A spokesperson for Kate told the Telegraph at the time: "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 pair share three children in Prince Louis, Prince George, and Princes Charlotte.