Nastia Liukin announces gymnastics comeback

2008 Olympic all-around Champion Nastia Liukin Tweeted today, "Let the journey officially begin." USA Gymnastics confirmed that the Tweet means Liukin is training again to make a run for the 2012 Olympic Games in London.

Liukin, who won five medals at the 2008 Olympic Games, says she will concentrate on the uneven bars and balance beam, but most likely will not compete in the all-around. She will begin two-a-day training sessions when she returns to Dallas from the World Championships in Tokyo, Japan, where she has official responsibilities with the International Gymnastics Federation.