Sport Relief 2012 has launched and this year more than one million people are expected to pull up their socks and take part in the Sport Relief Mile.
The aim is to raise some serious cash for vulnerable people across the UK and the world's poorest countries.
Celebrating the UK's biggest year of sport, a whole host of famous faces from the world of sport and entertainment will be taking part in Sport Relief Mile events across the length and breadth of the country on Sunday 25 March.
Singer Olly Murs, TV host Lorraine Kelly, actress Kara Tointon and Olympic gold medal rower James Cracknell are among the many celebrities taking part.
You too can go the extra mile by choosing to take on either one, three, or six miles and entering online at www.bbc.co.uk/sportrelief
He swam a staggering 140 miles along the Thames, raised more than £1m and even rescued a dog! A documentary catching every splash will be shown in the lead up to the Sport Relief Weekend.
Also taking on her toughest challenge yet is Helen Skelton in Helen's Polar Challenge for Sport Relief which sees the daring Blue Peter presenter travelling 500 miles across the frozen wasteland of Antarctica in a bid to reach the South Pole.
All the action from Helen's Polar Challenge for Sport Relief will be shown in a special nine-week series on Blue Peter, from January to March.
February will see the return of the ever popular Let's Dance for Sport Relief hosted by Steve Jones and Alex Jones.
The show will feature a fresh batch of celebrities shimmying their way onto our screens every Saturday in the run up to the big Sport Relief Weekend on 23-25 March.
Tune in for a fantastic night of BBC TV entertainment on Friday 23 March on BBC One from 1900 GMT.
Claudia Winkleman, Fearne Cotton and Gary Lineker will join other top presenters to host a night of comedy sketches including award winning comedian Miranda Hart's special Sport Relief 'Miranda' and the return of Outnumbered.
There will also be special Sport Relief episodes of Never Mind the Buzzcocks, 8 out of 10 cats, Mock the Week and A Question of Sport.
There will also be celebrity challenge highlights including David Walliams and Helen Skelton and films about the amazing work Sport Relief supports shown on the night.
On Sunday 25 March, BBC One will host the Sport Relief Mile Show which for the first time will be live in London from the Mall outside Buckingham Palace.
From Birmingham to Belfast and Leeds to London, it will bring all the highlights as the great British public are joined by a magnitude of famous faces as they tackle Miles all across the UK.
Money raised from Sport Relief will be spent helping some of the most vulnerable people in the UK and across the world's poorest countries.
There will be plenty of other ways to get involved. JLS have written and recorded the official Sport Relief single, Proud, which will be available to download on 18 March and in stores from 19 March.
Meanwhile, the Sport Relief Sock is back and to coincide with the nation's biggest year of sport, they feature a special Union Jack-inspired design and are made from Fairtrade cotton.
Find out more about how to get your socks or an official Sport Relief 2012 T-shirt (which can be personalized with your name) at www.bbc.co.uk/sportrelief
For more information about Sport Relief listen to BBC Radio 5 live on Thursday, 19 January as Eleanor Oldroyd presents a special Sport Relief launch show from 1930 GMT.