Video: Prince William follows Duchess of Cambridge's lead in October and takes part in volleyball session The Duke tried to dig the ball on the first occasion but missed and then let the ball practically land at his feet when the pint-sized volleyballer served again. After the first miss, a still buoyant Prince William kept up the talk with his team-mates, shouting: "Sorry, my bad." Prince William attended the event as patron of the The Royal Foundation of The Duke and Duchess of Cambridge and Prince Harry. The royal trio's charity launched the Coach Core programme in July last year - a day before the London Olympics. It provides an intense training programmeme for 16 to 24-year-olds, many from disadvantaged social backgrounds, to become qualified sports coaches and inspire their peers. The sport might be a favourite for the royal couple - the Duchess of Cambridge made headlines in October while playing volleyball during her first official outing since giving birth to Prince George. The Duchess' slim post-baby figure, revealed in skinny jeans and a top that showed her midriff during the game, became the main talking point during the event to help SportsAid workshop.