Olympic medalist Shawn Johnson announced on Sunday her retirement from the sport that she said was her "entire life": Gymnastics.
Her announcement came only days before the start of the U.S. gymnastics championships and weeks before the U.S. competes in the London Olympics.
In Johnson's press release, she explains why she was forced to retire.
“I still have the heart, drive, and desire to compete and help the USA at the London Olympics,” said Johnson, who also won two senior U.S. all-around titles. “Unfortunately, it has become obvious that my left knee is not able to sustain the demands of gymnastics any longer. All I can do now is gracefully retire and thank everyone who has believed in me and my journey."