In a tour focused on poverty alleviation work, Chinese President Xi Jinping visited a primary school in Laoxian Township, Pingli County in Ankang City, northwest China's Shaanxi Province, on April 21, 2020.

Xi said: "Lots of kids are wearing glasses now, and that worries me."

He said that children should sharpen the mind and toughen the body, which means to exercise more.