Prince Harry has just released a new video promoting how others can join the Royal Family by competing in the 2017 London Marathon on behalf of their Heads Together charity initiative, but wound up cracking himself with a fit of giggles.

“Congratulations if you’ve got a place in the Virgin Money London Marathon,” Harry, 32, said in the video. “I hope the first-timers amongst you are more excited than scared.”

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“If you already have a place and are undecided for who to run for, William, Katherine and I would like to invite you to run with Heads Together … Together, we can start the biggest ever national movement to end stigma on mental health and change the conversation for everyone,” he says, adding: “The three of us can’t wait to cheer you on.”

He concludes by putting on a blue headband emblazoned with the Heads Together logo, which causes him to break into laughter as she says, “See you at the finish line.” Watch: