"These doctors need to carry an emergency bag weighing more than 10 kilograms. During their training to prepare for the Winter Olympics, I saw them just eating bowls of instant rice in order to save time for training, and also leave more time for their work at their respective hospitals," says Ren.

The doctors would fill syringes with medicine and pocket them inside their down jackets beforehand as a method of using their body temperature to prevent the medicine from freezing. Ren says she feels moved and had great respect for the doctors, hailing them as "heroes off the field".

Embodying China's promise to engage 300 million people in winter sports, one of the six episodes turns the lens on young ice hockey players at Zhenzhuquan (Pearl Spring) Central Primary School in northwestern Beijing's Yanqing district.

The school's ice hockey team was formed in 2017, when the then principal stumbled upon Zhao Jisheng, a retired physical education teacher from Beijing Normal University.