People learn Tai Chi at the Cinquantenaire park in Brussels, Belgium, Aug. 21, 2018. Every Tuesday and Friday afternoon, free Chinese Tai Chi class is held here and it attracts many local residents in Brussels. (Xinhua/Zheng Huansong)

People learn Tai Chi at the Cinquantenaire park in Brussels, Belgium, Aug. 21, 2018. Every Tuesday and Friday afternoon, free Chinese Tai Chi class is held here and it attracts many local residents in Brussels. (Xinhua/Zheng Huansong)

People learn Tai Chi at the Cinquantenaire park in Brussels, Belgium, Aug. 21, 2018. Every Tuesday and Friday afternoon, free Chinese Tai Chi class is held here and it attracts many local residents in Brussels. (Xinhua/Zheng Huansong)

A man learns Tai Chi at the Cinquantenaire park in Brussels, Belgium, Aug. 21, 2018. Every Tuesday and Friday afternoon, free Chinese Tai Chi class is held here and it attracts many local residents in Brussels. (Xinhua/Zheng Huansong)

People learn Tai Chi at the Cinquantenaire park in Brussels, Belgium, Aug. 21, 2018. Every Tuesday and Friday afternoon, free Chinese Tai Chi class is held here and it attracts many local residents in Brussels. (Xinhua/Zheng Huansong)

People learn Tai Chi at the Cinquantenaire park in Brussels, Belgium, Aug. 21, 2018. Every Tuesday and Friday afternoon, free Chinese Tai Chi class is held here and it attracts many local residents in Brussels. (Xinhua/Zheng Huansong)

People learn Tai Chi at the Cinquantenaire park in Brussels, Belgium, Aug. 21, 2018. Every Tuesday and Friday afternoon, free Chinese Tai Chi class is held here and it attracts many local residents in Brussels. (Xinhua/Zheng Huansong)

People learn Tai Chi at the Cinquantenaire park in Brussels, Belgium, Aug. 21, 2018. Every Tuesday and Friday afternoon, free Chinese Tai Chi class is held here and it attracts many local residents in Brussels. (Xinhua/Zheng Huansong)

People learn Tai Chi at the Cinquantenaire park in Brussels, Belgium, Aug. 21, 2018. Every Tuesday and Friday afternoon, free Chinese Tai Chi class is held here and it attracts many local residents in Brussels. (Xinhua/Zheng Huansong)