Fa Jing or Centrifugal Force

From the central to the peripheral, from the Tan Tien to the Tip of the Finger as the masters say. Chinese martial arts has always highly regarded what is termed as the Force at the Finger Tip. Think of it as a whip lash effect.
Let us use the example of Brush Knee, Step and Push. Go to the last bit of the move after you have taken the step. You begin to transfer your weight forward, nearing the end of the weight change you begin to turn your pelvis. Your hand, following the momentum, begins to travel forward as your trunk stops moving (and actually initiates the next move). All the force of your forward step and twisting movement of the trunk is translated to your hand. That is Fa Jing. Practise this maybe a bit faster, that way you as a beginner may feel the movement better. Then when you feel it, slow it down again
Eventually, when Chi runs freely, it will move out from the Tan Tien and make the circuit to the finger tip and back to its source.