Nastia Liukin's is an elite gymnast. As of 2008 she is considered the best gymnast in the world. Nastia has the highest rank in gymnastics.
At the 2008 Games, that was Nastia Liuken of the United States.
Shawn Johnson is one of the best American Gymnasts. Nastia Liukin is very good too. But, Nadia Comaneci was the first gymnast to get a perfect 10 in Olympic Gymnast history.
Olga Korbut is the best gymnast. She is from Russia. But that's just an opinion.
The best women gymnast in the world is beth tweddle.
The tallest gymnast is around 5'9
Well actually the youngest gymnast in the Beijing 2008 is He Kexin's she is not usa but she is 13 yrs old.