Wang Qiang of National Cross-Country Skiing Team lies on the ground after finishing the men's 15km mass start classic event at the FIS Cross-Country Skiing China City Tour in Sarkobu Cross-Country Ski Track, Altay City, northwest China's Xinjiang Uygur Autonomous Region, May 10, 2021. (Photo by Zanghaer Bolati/Xinhua)

Chi Chunxue of National Cross-Country Skiing Team competes during the women's 10km mass start classic event at the FIS Cross-Country Skiing China City Tour in Sarkobu Cross-Country Ski Track, Altay City, northwest China's Xinjiang Uygur Autonomous Region, May 10, 2021. (Xinhua/Hou Zhaokang)

Wang Qiang of National Cross-Country Skiing Team competes during the men's 15km mass start classic event at the FIS Cross-Country Skiing China City Tour in Sarkobu Cross-Country Ski Track, Altay City, northwest China's Xinjiang Uygur Autonomous Region, May 10, 2021. (Photo by Zanghaer Bolati/Xinhua)

Athletes get ready for the men's 15km mass start classic event at the FIS Cross-Country Skiing China City Tour in Sarkobu Cross-Country Ski Track, Altay City, northwest China's Xinjiang Uygur Autonomous Region, May 10, 2021. (Photo by Zanghaer Bolati/Xinhua)

Shang Jincai (L) and Liu Rongsheng of National Cross-Country Skiing Team celebrate after finishing the men's 15km mass start classic event at the FIS Cross-Country Skiing China City Tour in Sarkobu Cross-Country Ski Track, Altay City, northwest China's Xinjiang Uygur Autonomous Region, May 10, 2021. (Photo by Zanghaer Bolati/Xinhua)

Athletes compete during the men's 15km mass start classic event at the FIS Cross-Country Skiing China City Tour in Sarkobu Cross-Country Ski Track, Altay City, northwest China's Xinjiang Uygur Autonomous Region, May 10, 2021. (Photo by Zanghaer Bolati/Xinhua)

Chi Chunxue of National Cross-Country Skiing Team competes during the women's 10km mass start classic event at the FIS Cross-Country Skiing China City Tour in Sarkobu Cross-Country Ski Track, Altay City, northwest China's Xinjiang Uygur Autonomous Region, May 10, 2021. (Xinhua/Hou Zhaokang)

Athletes compete during the women's 10km mass start classic event at the FIS Cross-Country Skiing China City Tour in Sarkobu Cross-Country Ski Track, Altay City, northwest China's Xinjiang Uygur Autonomous Region, May 10, 2021. (Photo by Zanghaer Bolati/Xinhua)

Liu Rongsheng of National Cross-Country Skiing Team competes during the men's 15km mass start classic event at the FIS Cross-Country Skiing China City Tour in Sarkobu Cross-Country Ski Track, Altay City, northwest China's Xinjiang Uygur Autonomous Region, May 10, 2021. (Xinhua/Hou Zhaokang)