Guan Chenchen (R), a member of China's women gymnastic team, takes part in a training with her coach Wang Qunce at Chow's Gymnastics and Dance Institute in West Des Moines, Iowa, the United States, on Dec. 27, 2017. Four Chinese women gymnasts have been attending a 20-day training program since Dec. 11. (Xinhua/Yin Bogu)