And they're off! Kate, William and Harry race in a 100M relay sprint for Heads Together

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Talk about sibling rivalry. They may not be running a marathon any time soon, but they sure can sprint!

The Duke and Duchess of Cambridge and Prince Harry were out in support today for their Heads Together teams for the London Marathon -- and after meeting with and encouraging those running this year, they took off on a little sprint themselves. Taking part in a relay with several other Heads Together team members, the royals threw themselves into the first 100 meter sprint of the relay.

Prince Harry came in first (but, to be fair, he once totally beat Usain Bolt in a race), with William not far behind. Kate definitely held her own -- getting off to a faster start than William, though he wound up taking second place away from her in the end!

40 PHOTOS
Kate, William and Harry go sprinting for Heads Together
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Kate, William and Harry go sprinting for Heads Together
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge play about before they run a race during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Prince William, Duke of Cambridge runs a race during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge, Prince Wiliam, Duke of Cambridge and Prince Harry take part in a race during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge race together as they join Team Heads Together at a London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 05: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge prepare to race together as they join Team Heads Together at a London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge smiles as she joins Team Heads Together at a London Marathon Training Day at the Queen Elizabeth II Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 05: Hrince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: The Duke and Duchess of Cambridge and Prince Harry join Team Heads Together at a London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge hug during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge takes part in a race during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge laughs as she joins Team Heads Together at a London Marathon Training Day at the Queen Elizabeth II Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 05: Iwan Thomas and Prince Harry during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge join Team Heads Together at a London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 05: Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge, Prince Wiliam, Duke of Cambridge and Prince Harry take part in a race during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Iwan Thomas and Prince Harry during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Prince Harry during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge takes part in a race during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge runs a race during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge hug during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Prince William, Duke of Cambridge during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge, back of dress, during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge play about before they run a race during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Prince William, Duke of Cambridge during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge and Prince Wiliam, Duke of Cambridge take part in a race during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge and Prince Wiliam, Duke of Cambridge take part in a race during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge and Prince Wiliam, Duke of Cambridge take part in a race during a training day for the Heads Together team for the London Marathon at Olympic Park on February 5, 2017 in London, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - FEBRUARY 05: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge join Team Heads Together at a London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 05: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge and Prince Harry join Team Heads Together at a London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 05: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry race as they join Team Heads Together at a London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 05: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge and Prince Harry join Team Heads Together at a London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 05: The Duke and Duchess of Cambridge and Prince Harry join Team Heads Together at a London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 05: The Duke and Duchess of Cambridge and Prince Harry join Team Heads Together at a London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 05: The Duke and Duchess of Cambridge and Prince Harry join Team Heads Together at a London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Chris Jackson/Getty Images)
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Whether or not the royal trio planned on participating in training day, they sure seemed to have fun, to the delight of the day's participants.

Making a point to have a strong Heads Together team at the London Marathon this year further supports William, Kate and Harry's goal to eliminate the stigmas around mental health. Taking over as the 2017 Virgin Money London Marathon Charity of the Year, the organization, and the famous trio behind it, are every day getting closer to that goal.

See more photos from the above day -- including the royal sprint!

Related: Kate's best casual outfits:

16 PHOTOS
Kate Middleton's Casual Style
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Kate Middleton's Casual Style
The Duchess recycled a pre-pregnancy outfit about a month ago, visiting a charity event (and playing a little volleyball) in J.Brand skinnies, a striped Ralph Lauren top and Start Weitzman wedges.
For her first official appearance since welcoming baby George, Kate attended an event on Anglesey with William. She was wearing a Zara top and black skinny jeans.
In the early stages of her pregnancy, she wore jeans, wellies and a cute army-green coat to roast some marshmallows with children.
We saw lots of Kate's casual style during the 2012 Olympics, and we loved her bright pink jeans!
Rocking the UK's colors, Kate wore these bright red sneakers during the games.
And how better to support the UK than wearing bold blue jeans??
This outfit, later worn post-pregnancy, is cute and comfy.  She's wearing a Ralph Lauren top, Smythe blazer, J.Brand jeans and Stuart Weitzman wedges.
While visiting Malaysia, the royal couple showed off their casual style.
Kate stands with her pup, Lupo, wearing skinny jeans, wellies and a cute brown coat.
Kate wore her L.K. Bennet wedges with skinny jeans and her Smythe blazer as she and Wills stepped off a plane at a Canadian airport.
Wearing her favorite boat shoes and skinny jeans, Kate looked comfy in Canada.
Wearing wedges and jeans, Kate topped off this look with a leather jacket.
Kate watched William play polo in a classic sweater and jeans.
Kate and Pippa were comfy in boots and jeans.
Kate was part of a rowing team in 2007, wearing a cute sweater to keep warm on the water.
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