Name: Sir Steve Redgrave
Famous, why? The British rowing legend won five consecutive Olympic gold medals.
Bio: Sir Steve has a total of six Olympic medals to his name, including a bronze from the 1988 Games, plus numerous other World Championship and Commonwealth titles. In 2011, he was given the BBC Sports Personality of the Year Lifetime Achievement Award. He was a Team GB mentor at the 2012 Olympic Games and took part in the opening ceremony and the torch relay.
Then: Winning gold in Sydney in 2000
Now: London 2012 Olympic Games opening ceremony
The Jump starts on Sunday 26 January on Channel 4