Taijiquan (Hànzì: 太极拳, Pinyin: Tàijíquán, On'yomi: Taikyokuken) is a traditional martial art from China. It's split into five main different styles that descend from five families:
Chen, 陳式太極拳 (Pinyin: Chén Shì Tàijíquán)
Yang, 杨式太极拳 (Pinyin: Yáng Shì Tàijíquán)
Wu/Hao, 武/郝式太极拳 (Pinyin: Wǔ/Hǎo Shì Tàijíquán)
Wu 吴式太极拳 (Pinyin: Wú Shì Tàijíquán)
Sun 孙式太极拳 (Pinyin: Sūn Shì Tàijíquán)
In the Shenmue series, Ryo Hazuki meets many practitioners of Taijiquan, mostly Chen style.