Skaters compete during the speed skating men's 5,000-meter test event for the Beijing 2022 Winter Olympics at the National Speed Skating Oval in Beijing, China, April 7, 2021. /CFP

The interior of the National Speed Skating Oval, also known as the "Ice Ribbon," in Beijing, which will host speed skating events during the 2022 Winter Olympics, January 28, 2021. /CFP

The exterior of the National Speed Skating Oval in Beijing, January 28, 2021. A total of 14 gold medals for speed skating events will be awarded here during the 2022 Winter Olympics. /CFP

Workers view the structure of newly completed National Speed Skating Oval ahead of the 2022 Beijing Winter Olympics test events in Beijing, March 31, 2021. /CFP

An ice worker cleans the ice surface during an interval of a speed skating test event for the Beijing 2022 Winter Olympics at National Speed Skating Oval in Beijing, China, April 7, 2021. /CFP

A Chinese skater competes in the 3000 meter speed skating test event for the Beijing 2022 Winter Olympics at the National Speed Skating Oval in Beijing, China, April 7, 2021. The events, which run April 1-10, are the first tests at these venues for the Games which are set to open on February 4, 2022. /CFP