Gymnast Shawn Johnson is hopeful but realistic about her return

The 20-year-old who won four medals at 2008 Olympics attempts comeback after layoff and knee injury from ski accident, but she knows competition from big group of younger girls will be tough.

Since she won four medals at the 2008 Olympics, including a gold in the balance beam, Shawn Johnson has retired from her sport, written a book, won the mirror ball trophy on "Dancing With the Stars," torn up her knee while skiing and had reconstructive surgery.

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