Xiqing District of Tianjin in the old days. "Swallow Gate" mainly focuses on lightness skills: Yan Sanyong, Yan Eighteen Flying and Yan Chongtian. In fact, flying skill is to improve your jumping ability through a special training method. Yanzimen was a sect in Xiqing District of Tianjin in the old days, which mainly focused on lightness skill. A sect is a community, an organization formed by people uniting in some way.