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The Duke of Cambridge joked that he was like "giraffe on ice" on a football field during a visit to an academy school in south-east London.
He said: "Watching me on the football field is never a pretty sight – the expression giraffe on ice springs to mind.
"However it is marginally less embarrassing than seeing my brother cheat his way to becoming the fastest man on the planet!
"Catherine, on the other hand, with a tennis racquet or a hockey stick is something to behold and be aware of."
The royals visited the academy school to attend the launch of a new project that is being supported by their charitable Foundation.
The Duke and Duchess of Cambridge and Prince Harry arrive for the launch of a new sports project in south east London that aims to train the next generation of sports coaches.
Young trainers are expected to put their students through their paces for the royal trio, whose charitable foundation is supporting the initiative.
Judo, basketball, five-a-side football and table tennis will be demonstrated for William, Kate and Harry during a visit to a college in Rotherhithe.
Latest ITV News reports
The Duchess of Cambridge played table tennis, tried out some judo moves and even kicked a football at the launch of a new sports project.