Bagua Zhang can be used as health exercise, meditation or a very efficient martial art.
As exercise it gives you flexibility and power that enables you to move unpredictably fast and with grace.
It is better to learn Chi gung / Nei gung first or simultaneously with it, and then Taiji or Bagua. It’s easier to understand the mechanics of the body this way in internal arts. In Chi gung / Nei gung you learn the basic principles of movements that will save you a lot of time and frustration.