Prince William has had a go at football in the run up to London 2012, but failed to net a goal.
The Olympic ambassador was joined by his wife and brother as they showed off their sporting skills ahead of the Games.
In a speech to launch the Coach Core project, which will work in deprived areas, the Duke, who showed determination despite failing to actually score, described his efforts as like a "giraffe on ice".
The Royal trio were at Bacon's College in Rotherhithe, south-east London, to help launch the project run by the charity Greenhouse and inspired by the need to create a training programme in recognition of London hosting the Olympics.
William told those at the event: "What all three of us have in common is that we love sport. And not just playing it, but for what it does for people young and old. It builds confidence, engenders mutual respect and responsibility, and teaches us about the value of team work.
"That's why Catherine, Harry and I are so excited about Coach Core, this brilliant programme developed by the Greenhouse Charity in partnership with our foundation."