Maddie Meyer/Getty19-year-old US gymnast Simone Biles is expected to be one of the breakout stars in Rio in her first Olympics this year. On Thursday, former gold-medal gymnast Shawn Johnson went on "Sports Center" to talk about Biles and her chances in Rio. During the interview, Johnson pointed to a subtle, funny move Biles pulled during her routine in June's P&G Championships as proof that Biles is incredibly gifted.