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7th February 2017
09:49am GMT

It was to raise awareness for Heads Together, a mental health campaign.
And Will might be first in line for the throne but he was second across this finish line with Harry comfortably beating his big brother.
The royal siblings laughed and joked ahead of the race with William pretending to block Kate at the starting block.
And despite being known for her sporting prowess, Kate finished last.
Wearing a red jacket, black trousers and black runners, the style icon looked relaxed and happy with her hair pulled back in a loose ponytail.
Mental health is a very important topic to the Royals and William, Harry and Kate have advocated for awareness on this issue for years. Kensington Palace tweeted:
"Their Royal Highnesses are championing the #HeadsTogether campaign to urge people to talk about mental health"