Twin sisters Gao Ning and Gao Ding practice acrobatics on March 9, 2016 in Changchun city, Northeast China's Jilin province. The twin sisters have practiced acrobatics since childhood. The two married identical twin brothers Chen Kun and Chen Peng and the acrobatic couples have each since become parents of girls who are now also learning the acrobatic arts. They now form their own acrobatics team and give performances. [Photo / Chinanews.com]