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SAN ANTONIO, TX - JULY 16: Michael Phelps trains during the 2016 U.S. Olympic Swimming Team Training Camp Media Day on July 16, 2016 in San Antonio, Texas. (Photo by Ronald Martinez/Getty Images)

SAN ANTONIO, TX - JULY 16:  Michael Phelps trains during the 2016 U.S. Olympic Swimming Team Training Camp Media Day on July 16, 2016 in San Antonio, Texas.  (Photo by Ronald Martinez/Getty Images)