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"Engaging and cooperating with China is both an opportunity and necessity," Michel was quoted by media as saying.

"Even as women have gained equality in access to education and work, decisions on having more children are constrained by their 'second shift' in taking care of children and managing households," said Won Do-yeon, chief of the UNFPA's Seoul office, in an email interview with Reuters.

"Despite growing public participation in exercise, the lack of awareness that this is a science, not just a habit, is taking a toll on exercisers' efforts and even causing serious harm now and then," said Tian Ye, a sports physiology professor at Beijing Sport University and head of the group that compiled the report.

"During the 2nd CIIE, 181 countries, regions and international organizations in total attended the expo, with more than 3,800 enterprises participating in the exhibition. The total exhibition area reached 360,000 square meters. We had more than 500,000 professional visitors registered, greatly exceeding the amount of the first CIIE," he said.

"Entrepreneurs usually suffer from suboptimal health, so practising tai chi can help improve mental and physical health," said Huang.