Turkish Tai Chi instructor Esat Atac (front) leads his students to practice Tai Chi, an ancient Chinese martial art, in Istanbul, Turkey, on Aug. 9, 2018. Tai Chi has recently become an appealing activity, especially for those who feel stressed out living in big cities like Istanbul, according to Mustafa Karslioglu, deputy head of the Turkish-Chinese Cultural Association. (Xinhua/He Canling)