Aerial photo taken on Aug. 2, 2020 shows people taking part in a walking event at a park in Xingtai City, north China's Hebei Province. (Xinhua/Mu Yu)

Photo taken on Aug. 2, 2020 shows people taking part in a walking event at a park in Xingtai City, north China's Hebei Province. (Xinhua/Mu Yu)

Aerial photo taken on Aug. 2, 2020 shows people taking part in a walking event at a park in Xingtai City, north China's Hebei Province. (Xinhua/Mu Yu)

Photo taken on Aug. 2, 2020 shows people taking part in a walking event at a park in Xingtai City, north China's Hebei Province. (Xinhua/Mu Yu)