LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry race during a Marathon Training Day with Team Heads Together at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England.

LONDON, ENGLAND – FEBRUARY 05: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry race during a Marathon Training Day with Team Heads Together at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England.