Flavio Canto is a judo guy who came 3rd at the Athens Olympics, He helps out underprivleged kids to do judo and jiu jitsu.
Here is an article on what he does for the kids
Flavio Canto spent most of his teenage years training in judo, in hopes he would achieve Olympic gold. But today, the Brazilian athlete considers his defeat at the 2000 Olympic trials one of his greatest victories.
The loss led Canto -- who later won bronze at the 2004 Olympic Games -- back to his native Rio de Janeiro. Since then, he has helped thousands of young people from the city's toughest shanty towns find hope in the midst of hardship.
"I've never seen any place as beautiful as Rio de Janeiro, but it does have its dark side," said Canto, 34. "There is violence all over."
To read the full article go here.
As well asa video done by CNN on him helping the children of brazil
highlight reel of Canto