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

LONDON, ENGLAND - FEBRUARY 05: The Duchess of Cambridge competes against The Duke of Cambridge and Prince Harry during the Team Heads Together at a London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)

Chris Jackson Collection Chris Jackson