Michelle Obama in London

Michelle Obama hosted a sporting event - called Let's Move! - at the US ambassador's residence in central London for about 1,000 US military children plus US and British students.

Let's Move! is an initiative created by the First Lady in a drive to combat childhood obesity within a generation.

David Beckham appeared with the First Lady - with SpongeBob SquarePants and the Power Rangers on hand to entertain the children.

It is hoped the sports stations provided by Nickelodeon, the NBA and USA Basketball, US Tennis Association, USA Field Hockey, USA Track and Field, Manchester United and Right to Play will help the youngsters get active.