One of the world's greatest sportsmen has announced he's coming out of retirement.
Cyclist Lance Armstrong won the world's toughest bike race, the Tour de France, an amazing seven times after recovering from cancer.
The 36-year-old American stopped racing three years ago, but now he wants to try and win his eighth Tour de France in 2009.
Armstrong said he wants to race to raise awareness of cancer.
In 1996, Armstrong was only given a 50% chance of survival after doctors discovered he had the disease.
But he recovered, and went on to dominate one of the toughest sporting events in the world.
Lance Armstrong retired in 2005
Since his retirement in 2005, he has run in the New York and Boston marathons, but he's also spent a lot of time running the Lance Armstrong Foundation, a charity dedicated to fighting cancer.
He said: "I'm happy to announce that after talking with my children, family and closest friends, I have decided to return to professional cycling.
"It is in order to raise awareness of the global cancer burden."