Davina McCall, Kirsty Gallacher and Kate Thornton were among celebs who helped launch Sport Relief 2006.
This year's money-raising challenge is to travel one mile in any way you choose - and get sponsored to do it.
You can run, walk, skip or come up with your own method of getting across one of 15 main National Miles or dozens of Local Miles throughout the country.
Money raised will be split between helping people in the UK and those in some of the world's poorest countries.
Fund raising events will take place across the UK on Saturday 15 July along with a star-packed night of entertainment on TV.
This will include celebrity show-jumping, a special edition of A Question of Sport, All Star Boxing and Celebrity Mastermind.
Sport Relief has already raised £31m to help disadvantaged people since it started in 2002.