Agree with Mr Kelly Graham:
Kelley Graham wrote: As far as comments on BaGuaQuan being similar and an extension of XingYiQuan, my understanding differs greatly.
Maybe the gent in the OP vid sees his own Bagua as an extension of his XY, he is free to do so. Though some people would regard it as an insult.
But speaking about XY or BGZ, you shouldn't really speak for all XY and BGZ, there are very different schools and philosophies and there is no general standard shared by all of them.
However, from my own personal experience studying 3 different Bagua styles, any traditional Bagua style is taught as a complete system and doesn't need any companion or help from any another art. They have all foundational exercise to build structure and rooting (stationary as well as dynamic). If you compare them, the variations I've studied have all very different engines, and don't really match with each other. No one of them is even close to the standard Hebei XY engine I've studied. The Yin Bagua school I briefly studied and gave up fast is incredibly complex. Every animal has a completely unique engine. Every animal is like studying a complete martial arts system. And, from what I know about the animals, still none of them are similar to the more common XY schools.
However, in general, XY and BG do share some similar basic exercises or jibengong, especially for developing vertical spinal power and movement. And often also some exercises similar to what is found as typical tongbei foundational practice. but those exercises can often be found in many other northern styles, as used by Tai Chi schools, Bajiquan etc.
BTW, I always enjoy watching Byron's videos.