Anita Alvarez and Mariya Koroleva compete in the women's duets synchronized swimming technical routine preliminary on Monday in Rio de Janeiro. Koroleva has suffered several concussions over the years. Al Bello/Getty Images hide caption

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Al Bello/Getty Images

When Swimmers Get Out Of Sync, The Result Can Be A Kick In The Head

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U.S. swimmer Katie Ledecky holds up her gold medal after winning the women's 800-meter freestyle swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Games in London. Lee Jin-man/AP hide caption

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Lee Jin-man/AP

Frank Deford: Olympic Swimmer Ledecky Is This Century's Perfect 10

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Yusra Mardini visits the Olympiapark Berlin on March 9. The 18-year-old Syrian refugee hopes to qualify for the Rio Olympics as a swimmer on the refugee team. Alexander Hassenstein/Getty Images for IOC hide caption

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Alexander Hassenstein/Getty Images for IOC

French marathon swimmer Benoit Lecomte (left) prepares to jump into the Potomac River in Washington, D.C., in 2002. In 1998, Lecomte swam across the Atlantic Ocean. Manny Ceneta /AFP/Getty Images hide caption

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Manny Ceneta /AFP/Getty Images

Ben Lecomte Swam Across The Atlantic; Next He Tries The Pacific

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Daina Bouquin competes in the first U.S. Winter Swimming Championships on Saturday in Lake Memphremagog near Newport, Vt. The event drew swimmers from around the world to race in icy water that was below 32 degrees F. Herb Swanson for NPR hide caption

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Herb Swanson for NPR

'Cold Actually Feels Good' At The U.S. Winter Swimming Championship

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Attorney Robert Allard, seen here with former swimmer Jancy Thompson in 2010, says USA Swimming still needs to improve its handling of sexual abuse claims. The organization is also facing congressional scrutiny. Ben Margot/AP hide caption

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Ben Margot/AP

USA Swimming Faces Lingering Doubts Over Sexual Abuse

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Lance Armstrong warms up for the swimming leg of the 2011 Xterra World Championship triathlon in Kapalua, Hawaii (before he was banned from most competitions). This weekend, he'll swim in a Texas meet for masters swimmers. Hugh Gentry /Reuters /Landov hide caption

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Hugh Gentry /Reuters /Landov