https://www.internalartsinternational.c ... -lesson-1/
In all the years of bagua I have watched, never have I seen someone, more or less, publicly begin a discussion about it, let alone teach.
It has been a part of the bagua practice I learned 15 years back and Tom Bisio does an excellent job of illustrating and teaching it.
Unfortunately you have to subscribe to the site but for those who want to expand their knowledge of the internal Arts, it is one of the best sources and worth every penny.