Chen Fake Silk Reeling Power Exercise

In my Chen Zhonghua Workshop Notes Unfiltered Series, I wrote the following:

Chen Fake’s secret method: engage the exercise of stretching the wrists/fingers by motioning the hands over the shape of the elbow. Imagine standing with arms crossed, in this position alternate the stretching of one hand over the shape of the elbow.  The hand/wrist stretches forward and then curves around the shape of the elbow.  This helps in developing silk reeling power.

-- Source: Chen Zhonghua Workshop Notes Unfiltered Part 2

I received an inquiry to elaborate on this exercise.  The best way I can think of is to show a video of the exercise. So, without further ado:

When I do this exercise, I try to stretch with my middle finger as the arm twists and spirals. If I pause the action as my hand begins to wrap around my elbow using a spiraling motion, I try to feel a stretch in the wrists. It’s all about stretching :)