On Sunday the three royals were accompanied by 150 runners training for the London Marathon at the Queen Elizabeth Olympic Park.
Harry eventually came in first, with William as runner-up and Kate following close behind the two brothers.
A video of them racing was shared by the Heads Together campaign, with the caption: “Catherine, William And Prince Harry training with the #TeamHeadsTogether.”
— Kensington Palace (@KensingtonRoyal) February 6, 2017
Kate, William and Harry often join forces for the mental health campaign by taking part in various events that support their cause.