Tony Hawk is the most famous skateboarder in the world. He has won more skateboarding competitions than anybody else. He has also involved more than eighty skateboarding tricks and was the first person to do one famous trick called the '900' . The 900 is a 360 somersault done two and a half times in the air! It took him sim years to learn the 900. He finally did it in 1999. Since then only four other people have been able to do it.