Hu Mingyao (left), 27, from Yongjia county in Wenzhou, Zhejiang province. [Photo/hangzhou2022.cn]

According to Yin Shiqiang, coach of the national men's team, Hu's vision isn't as bad as that of his teammates, as international rules state that all athletes must be legally blind, meaning they have less than 10 percent vision and are classified as B3, B2, or B1 – totally blind. Players must wear opaque eyeshades at all times to ensure fair competition.

The object of the game is to throw a ball past opponents and into a net to score points. Players stay on their hands and knees to defend their net and score against their opponents.

Yin also explained that the players are currently focusing on throwing balls, stamina and strength in their training in Hangzhou.

"As they circle around the field day after day, they know by heart when and how far to run," Yin said.