Fajing is not pushing!
Fajing is a forceful injection of power into the opponent’s body. To do this we employ imaging techniques, commonly described in the principles “use intention, do not use strength”.
In the clip above I contrasted the difference between pushing mechanically and using intent to generate the power. You can see the difference in how this affects the opponent.
There is an illustration of the fajing process described here on page 160, TaijiKinesis Vol 2.