Sport Relief 2008 is all about challenging yourself, friends, family and colleagues to do something sporty to raise cash.
Jonathan Ross and Jimmy Carr take to the tennis court for Sport Relief
And TV star Jonathan Ross has done just that by challenging comedian Jimmy Carr to a celebrity doubles tennis match.
Ross will team up with former British number one and 1997 US Open finalist Greg Rusedski.
Carr has been paired with 1987 Wimbledon winner Pat Cash for the game at London's Albert Hall.
Alan Shearer and Adrian Chiles will also be rising to the challenge for Sport Relief when they take on a Newcastle-to-London cycle ride.
Olympic gold medal-winning rower James Cracknell will be taking the lead in inspiring the nation by undertaking a momentous challenge, travelling from England to Africa under his own steam.
A host of other sporting celebrities will be getting involved as Sport Relief presents special editions of Strictly Come Dancing, The Apprentice, Question of Sport and the Antiques Road Show.
Jonathan Ross' All-Star Tennis will be part of Sport Relief's cracking night of entertainment on Friday 14 March.
But in the meantime you can get involved in Sport Relief by signing up for one of the Sainsbury's Sport Relief Miles on Sunday 16 March - there will be hundreds all over the UK.
This year participants can set up their own challenge by having the choice of running one, three or six miles.
There are 23 flagship events in every region of the UK and a further 200-plus Miles organised at local schools, sporting clubs and almost anywhere else you can think of.
So, there is bound to be one close to you. All you have to is sign up and start getting yourself sponsored!
It costs £5 for adults and £2 for children (under 16) to enter, or £12 for family entry (two adults, two children). Entry fees cover costs only and do not include a donation to Sport Relief.
Sport Relief asks that everyone that takes part gets sponsored and raises money.
Don't forget that you don't have to do a mile to raise money for Sport Relief, you could add a donation on to the usual cost of playing tennis or arrange a special match?
Maybe you could do a sports quiz in the office or perhaps pay a set fee to wear a football shirt to work or school?
Comic Relief will then spend the money you raise to help vulnerable people living incredibly tough lives both at home in the UK and in the world's poorest countries.