It is something I observed from personal experience.
Well, I was watching a demonstration and I tried it out. Don't really know if it's exactly the same or not because I use the foot work from Karate.
I would very much like to practice Baji if I ever had the opportunity. If I could afford going to Taiwan then I might take up Baji.
The charging step I got from observation, research and practice. Let's just say, I spent a few weeks just trying to figure out how to put momentum behind every attack, a lot by trial and error.