The Duke & Duchess Of Cambridge And Prince Harry Join Team Heads Together At A London Marathon Training Day [Getty Images]

LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge with Prince Harry and Prince William, Duke of Cambridge take part in a race during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

UK Press Mark Cuthbert