One spectator, women's marathon world record-holder Paula Radcliffe, joked afterward that William should have been disqualified for straying into Kate's lane.
The royals appeared joined almost 150 Head's Together volunteers who are preparing to run the 2017 London Marathon at the starting line of London Marathon Community Track. Concerns unfortunately did not have Kate Middleton and Prince William.
The three royals were in high spirits before they hit the track, with Prince William quipping "Oh my hamstring" in the lead up.
According to the Heads Together Facebook page, the charity initiative will be "the biggest single project Their Royal Highnesses have undertaken together".
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William will give the runners words of encouragement and, with his wife and brother, set out how the marathon's 38,000 participants can make the 2017 Virgin Money London Marathon the "mental health marathon".
After the training was completed Prince William addressed the athletes.
Kensington Palace recently released a statement regarding Kate's Royal duties.
The event took place at Queen Elizabeth Olympic Park, where 150 runners were gathered to promote Heads Together- a collective of charities which aims to change the conversation surrounding mental health. Instead of a romantic night together, the Duchess of Cambridge will prioritize visiting the Royal Air Force cadets at Cambridgeshire base in England.