Michelle Obama

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U.S. first lady Michelle Obama practices tai chi with students at Chengdu No.7 High School in Chengdu in southwest China's Sichuan province Tuesday, March 25, 2014. (AP Photo/Andy Wong)

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A U.S. secret service officer checks a Chinese performer dressed as an ancient warrior as U.S. first lady Michelle Obama visits a nearby city wall in Xi'an, in northwestern China's Shaanxi province, Monday, March 24, 2014. (AP Photo/Alexander F. Yuan)

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U.S. first lady Michelle Obama, center, hugs her daughters Malia, left, and Sasha, right, when they watch a performance during their visit to an ancient city wall in Xi'an, in northwestern China's Shaanxi province, Monday, March 24, 2014. (AP Photo/Alexander F. Yuan)