Prince William says he would run a marathon, Kate Middleton sweetly teases him

Prince William apparently has set great goals for the new year, but his wife doesn’t seem to take them very seriously.

While attending an event with William and Harry in support of their Heads Together campaign at the Institute of Contemporary Art in London, on Tuesday, the Duchess of Cambridge could not help but slip a joke about her husband.

William spoke to Good Morning Britain reporter Sean Fletcher and revealed his desire to run a marathon one day.

“I chatted to Prince William, and he has promised that he will run a marathon in Kenya sometime,” Fletcher told reporters. [via People]

This anecdote did not fail to make the Duchess react, as Fletcher then added, “Then I spoke to Kate and she said, ‘I’ll believe it when I see it.’”

This week, William, Kate and Harry attended the preparatory meeting of the London Marathon in support of their Heads Together campaign.