From left: Lee Kang-in. Son Heung-min and Lee Dong-gyeong of the Korean national football team train at the Zions Bank Training Center in Herriman, Utah, on June 1 [YONHAP]

SALT LAKE CITY —

After running 400 to 500 meters (0.25 to 0.3 miles), my heart was pounding, as if it would burst out of my chest at any second. My breathing was ragged, almost like I had finished an all-out sprint instead of a casual run, and a metallic taste coated my mouth.

Back in Korea, I can usually complete 4 to 5 kilometers (2.5 to 3.1 miles) with ease, but after running those few hundred meters in Salt Lake City, I was fighting the urge to stop.

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