Duke and Duchess of Cambridge and Prince Harry attend a training day for runners in London Marathon.
The Duke and Duchess of Cambridge and Prince Harry will join runners taking part in the London Marathon for their mental health campaign Heads Together.
Duchess Kate takes on Prince Harry and William in Royal relay, Series of Duchess Kate takes on Prince Harry and William in Royal relay, Duchess Kate takes .
The Duke and Duchess of Cambridge went head to head in a relay race this afternoon alongside Prince Harry as they turned out to support a training day for .