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Pop band JLS are to release this year's single for the ³ÉÈË¿ìÊÖ's Sport Relief, it has been announced.

The group has written and recorded the track, Proud, for the charity which encourages the nation to raise money by getting active.

The song will go on sale as a download from 18 March, and then on sale in shops the following day.

JLS will also perform a special one-off concert for Sport Relief at London's O2 Arena on 24 March.

This year, more than one million people are expected to take part in the Sport Relief Mile, raising money for vulnerable people across the UK and the world's poorest countries.

Celebrities including Olly Murs, Lorraine Kelly, Kara Tointon and James Cracknell will be among those taking part in sponsored running events across the UK.

Little Britain star David Walliams has already raised more than £1 million for this year's fundraising effort, following his 140-mile swim along the River Thames last year.

And Blue Peter presenter Helen Skelton is currently undertaking a 500-mile trek to the South Pole - skiing, cycling and kite-skiing for up to 14 hours a day.

Claudia Winkleman, Fearne Cotton and Gary Lineker will host a live television show on 23 March on ³ÉÈË¿ìÊÖ One.

It will feature special editions of sitcoms Miranda and Outnumbered, as well as episodes of Never Mind the Buzzcocks, 8 out of 10 Cats, Mock the Week and A Question of Sport.