Boy ballet dancers exercise at the art school Shanghai Little Star in Shanghai, east China, May 22, 2019. The Shanghai Little Star, a subsidiary of the SMG (Shanghai Media Group), opened its first boy ballet class in 2018. After one year of training, more than 20 boys between the ages of four and six, have gone through a series of tough exercises and become little ballet fans. (Xinhua/Liu Ying)

　　Boy ballet dancers pose for photos with teachers at the art school Shanghai Little Star in Shanghai, east China, May 22, 2019. The Shanghai Little Star, a subsidiary of the SMG (Shanghai Media Group), opened its first boy ballet class in 2018. After one year of training, more than 20 boys between the ages of four and six, have gone through a series of tough exercises and become little ballet fans. (Xinhua/Liu Ying)

　　Boy ballet dancers listen to their teacher during a class at the art school Shanghai Little Star in Shanghai, east China, May 22, 2019. The Shanghai Little Star, a subsidiary of the SMG (Shanghai Media Group), opened its first boy ballet class in 2018. After one year of training, more than 20 boys between the ages of four and six, have gone through a series of tough exercises and become little ballet fans. (Xinhua/Liu Ying)

　　A boy ballet dancer exercises under the guidance of an assistant-teacher at the art school in Shanghai Little Star in Shanghai, east China, May 29, 2019. The Shanghai Little Star, a subsidiary of the SMG (Shanghai Media Group), opened its first boy ballet class in 2018. After one year of training, more than 20 boys between the ages of four and six, have gone through a series of tough exercises and become little ballet fans. (Xinhua/Liu Ying)

　　Boy ballet dancers are guided by a teacher at the art school Shanghai Little Star in Shanghai, east China, May 22, 2019. The Shanghai Little Star, a subsidiary of the SMG (Shanghai Media Group), opened its first boy ballet class in 2018. After one year of training, more than 20 boys between the ages of four and six, have gone through a series of tough exercises and become little ballet fans. (Xinhua/Liu Ying)

　　A boy ballet dancer is guided by an assistant teacher at the art school Shanghai Little Star in Shanghai, east China, May 29, 2019. The Shanghai Little Star, a subsidiary of the SMG (Shanghai Media Group), opened its first boy ballet class in 2018. After one year of training, more than 20 boys between the ages of four and six, have gone through a series of tough exercises and become little ballet fans. (Xinhua/Liu Ying)

　　Boy ballet dancers have a class at the art school Shanghai Little Star in Shanghai, east China, May 22, 2019. The Shanghai Little Star, a subsidiary of the SMG (Shanghai Media Group), opened its first boy ballet class in 2018. After one year of training, more than 20 boys between the ages of four and six, have gone through a series of tough exercises and become little ballet fans. (Xinhua/Liu Ying)

　　Boy ballet dancers exercise at the art school Shanghai Little Star in Shanghai, east China, May 22, 2019. The Shanghai Little Star, a subsidiary of the SMG (Shanghai Media Group), opened its first boy ballet class in 2018. After one year of training, more than 20 boys between the ages of four and six, have gone through a series of tough exercises and become little ballet fans. (Xinhua/Liu Ying)