Yuk Shun But Yuk Yik Move in harmony rather than against the flow of force; A requirment forinternal martial arts. Traditional Writing: 欲順不欲逆 http://wingchunlexicon.com/wp-content/uploads/2016/12/JUK6-SEON6-BAT1-JUK6-JIK6-_mdash-Wing-Chun-Elements_-Glossary.mp3