Yang Xiuyun, a 72-year-old running enthusiast in Nanchang, Jiangxi province, exercises with her friends. At that time, Yang often saw people running along the Ganjiang River, even when it was windy or rainy. From running 5 km, then 10 km to 20 km and, finally, a full marathon, the distance that Yang was able to cover became longer and longer. …
