The Duchess of Cambridge took part in a relay race along with Prince William and Prince Harry on Sunday to support their charity Heads Together.
The three were joined by about 150 other runners who are training for the London Marathon at Queen Elizabeth Olympic Park in east London.
Athletes Iwan Thomas and Paula Radcliffe and presenter Sian Williams were also at the event.
Heads Together is a charity which is backed by the royals and aims to promote mental well-being in young people.
