Mariya Koroleva and Anita Alvarez stride in unison to the edge of a large swimming pool. Their swimsuits are spangly; their eye makeup, heavy. They wear nose clips. After a series of choreographed poses on the pool deck, they dive in.They are the only U.S. pair competing in the synchronized swimming duet event at the Rio Olympics. On Monday, their technical routine qualified them for Tuesday's finals.Back in June, the pair was working with head coach Lolli Montico on the same routine. At their training site in Moraga, Calif., Koroleva and Alvarez already had been in the water 3 1/2 hours. One hour left to go."No! I just said, 'Chin up,' and I didn't see it!" Montico shouts at the pair. "Chin up!"Montico, who is from Italy, watched every move. Synchronized swimming is about every move. Precision is key to impressing judges.But doing things just right helps keep these performances safe, too. Loose elbows and knees can be dangerous.Concussions are commonplaceThere are no hard statistics,
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