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

LONDON, ENGLAND - FEBRUARY 05: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Karwai Tang/WireImage)

WireImage Karwai Tang