Topless children brave the wintry weather in a military-style training session in Nanjing, East China's Jiangsu province, Feb 1, 2016. [Photo by Sun Lingke, Shi Yongxiang and Tang Shihua/Asianewsphoto]

It was to no one's surprise when it was revealed that the session was organized by He Liesheng, an entrepreneur whose extreme parenting skills earned him the nickname "Eagle Dad", similar to the famous Chinese American "Tiger Mom" Amy Chua.

It seems that exposing children to the winter chill is this father's favorite technique to toughen up the next generation. Four years ago, Mr He became the center of massive online controversy after he thrust his barely-clad son, then 4, to run against the freezing February weather in New York City.