Tai Chi practitioners demonstrate Tai Chi in Fremont, California, the United States, Feb. 8, 2019. A team of Chinese Tai Chi masters Friday started their tour to the United States to promote Chinese Tai Chi culture to overseas Chinese and American Kung Fu fans. San Francisco is the first stop of the team's 12-day Tai Chi Culture World Tour. The trip will also take them to two other U.S. cities of Las Vegas and Los Angeles. (Xinhua/Wu Xiaoling)