The fifth video introduces a basic way of raising the arms.
It is a little less detailed than how I actually teach it. But then the purpose of this video is not so much to teach as to act as a point of reference.
If you read TaijiKinesis Vol 2 : Learning the Taijiquan Form you can use this video as a reference for understanding what the 3-Count is about.
I wish I had a student when I was filming this. It would have made the video a lot more interesting by elaborating how the principles and way of moving affects the quality of power.
You can also see a quick demo of the Beginning Posture from Grandmaster Wei Shuren’s 22-Form. I did it a little bit faster so as not to put the viewer to sleep with the slowness.