A participant swims to cross a mud pool during the Mud Day athletic event at El Goloso Military base on the outskirts of Madrid, Spain, Saturday, June 11, 2016. Thousands of athletes got covered in mud as they celebrated International Mud Day running a 13-kilometer obstacle course on a sunny Saturday with heatwave-like temperatures up to a 29 degrees Celcius (around 84 degrees Fahrenheit). (AP Photo/Paul White)

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