Danish Crown Prince takes part in Great Wall Run in Beijing

Danish Crown Prince Frederik speaks with journalists after participating in the Great Wall Run at the Mutianyu section of the Great Wall of China on the outskirts of Beijing, Monday, Sept. 25, 2017. [Photo AP/Mark Schiefelbein]

Danish Crown Prince Frederik takes a selfie after participating in the Great Wall Run at the Mutianyu section of the Great Wall of China on the outskirts of Beijing, Monday, Sept. 25, 2017. [Photo AP/Mark Schiefelbein]

Danish Crown Prince Frederik, second from left, runs with others in the Great Wall Run at the Mutianyu section of the Great Wall of China on the outskirts of Beijing, Monday, Sept. 25, 2017. [Photo AP/Mark Schiefelbein]

Danish Crown Prince Frederik, front left, runs with others in the Great Wall Run at the Mutianyu section of the Great Wall of China on the outskirts of Beijing, Monday, Sept. 25, 2017. [Photo AP/Mark Schiefelbein]