Bagua has an unique way of teaching about internal power and as with all internal systems all one has to do, is to train in a few simple training methods in order to gain great power from within and from without. There are actually 16 training methods crammed into this one volume because each of the 8 sets has an inner part and an outside method. I.E. Fighting and entering methods when you are on the 'inside' of the attacker's arms and those when you are on the outside of his arms.
These methods can also be used as entering methods when an opponent has a strong on guard stance etc. They are done solo as well as with a training partner taking the energy or Qi right up through the ground and out of the palms. These are also excellent for the healing arts such as massage, tui-na, acupuncture etc.