In our Yang style there are 6 primary and 2 secondary forces. Together they correspond to the popularly known 8 forces of ward-off, rollback, press, push, split, pluck, elbow and shoulder forces.
For application purposes we can use each force on their own but more often than not they are combined and used together. For example we would use ward-off together with push or ward-off, push and press. Or use press with rollback. And so on.
The 8 forces are trained using the various movements in the form. In training we do not need to move fast or shake our body violently. All we need to do is to keep our intention on certain aspects and we will be able to train the use of the force as we play the form. In this respect, our fajing method is internal.