Baguaquan, Chinese 中文, English 英文, MaBu (horse stance)騎馬步, Retreat_Seminar in English, stances樁步

How to do MaBu馬步, have the circle

English video down below from Prague Retreat 2018

When the force in your knees just pointing to the side your SI is closing this is the wrong.
When you feel the circle and your SI opening that is better, that case you will have the stable Mabu. Worth to check these videos for this and other important points.