This is an excellent video by Ian Sinclair providing the student the feeling of relaxation during the displacement of the hand from the bottom to top.
I definitely got the feeling of the hand floating up for about 10 seconds immediately after performing the first exercise. This, in fact, matched what Master Chen once talked about someone's form looking more correct after performing about 100 times of Yilu in a row. A person will be so tired that he can no longer lift the hand by force. I can see how this little exercise can resemble such feeling after exhausting my strength in the arms.