Yuk Ding But Yuk Luen Move steadily do not move erratically; A requirement for internal martial arts. Traditional Writing: 欲定不欲亂 http://wingchunlexicon.com/wp-content/uploads/2016/12/JUK6-DING6-BAT1-JUK6-LYUN6-_mdash-Wing-Chun-Elements_-Glossary.mp3