The royals joined 150 volunteers from Team Heads Together who are preparing to run the 2017 London Marathon in support of the campaign, including women's marathon world-record holder Paula Radcliffe.
As the Queen and Prince Philip advance in age, Kate Middleton and Prince William have started to take on more patronships as part of their royal functions. William and Kate are known for their competitive nature but the couple laughed and hugged on the finish line, while Harry patted his brother on the back.
William tried to downplay that he was going to get beaten by his more athletic brother by playfully saying he had a hamstring issue.
The runners who were present at the training session will all be raising money for the mental health charities, when they participate in the London Marathon in late April this year. We wish him that William advantage of the absence of his wife to cook him one of those delicious dinners in head-to-head as they like, and they will enjoy his return.
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That response "exhibits a level of indifference and cruelty that are disqualifying for an education secretary", Gym said. DeVos has much to learn about our nation's public schools: how they work and the challenges they face".
After the training was completed Prince William addressed the athletes.
Kensington Palace have confirmed that the couple will not be spending the 14th February together.
The Duke and Duchess of Cambridge and Prince Harry will join runners taking part in the London Marathon for their mental health campaign Heads Together.
Thanks for looking out, Kate and Will. Instead, the Duchess will be heading to Cambridgeshire outside of London, England, to meet air cadets at an air force base.