The British royals promote mental health initiative at London Marathon training day

Time and time again, the British royals (Duchess Kate in particular) have proven they can look flawless doing just about anything.

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Duchess Kate is outrun by Prince William and Prince Harry in relay race

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Duchess Kate is outrun by Prince William and Prince Harry in relay race

Play Video - 1:01

Apparently, jogging in the park is no exception.

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The royals were ready to race and promote a worthwhile cause at the same time.

On Sunday, the Kensington Palace crew joined 150 other runners in Queen Elizabeth Olympic Park for a London Marathon training day. The event was held to promote Heads Together, the royal family's mental health initiative.

RELATED: Duchess Kate, Princes William, Harry team up for mental health PSA

Prince William, Duchess Kate and Prince Harry — along with current marathon world record holder Paula Radcliffe and sprinter Iwan Thomas — also took part in the relay at the community track before meeting event participants.

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And they're off!

Thanks to a video posted to the Kensington Palace social media accounts, we can see who scraped out a victory ...

Prince Harry! We have to say, with William's long legs and Kate's natural athleticism, we're a tiny bit surprised. Maybe Prince Harry got some extra practice running from trouble back in the day.

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The royals were all smiles while racing.

And let's get a long shot of the Duchess' outfit, shall we?

RELATED: Duchess Kate reveals what the royal family teases her about

Mark Cuthbert / UK Press via Getty Images
Way to go, Duchess Kate!

Perfectly put together ... and beaming, as usual. If only we looked so happy dragging ourselves to the gym!

Never change, royals. Never change.