What are the 3 things to streamline?

What common problems do these commands/goals/specific words correct:

By doing all 3 things, it addresses almost every single bad habit in streamlines.

Why do we do it at all? Why do we do it with beginners?

Streamline is the most efficient and best way to move through the water. Every stroke moves from streamline into movement. It is the easiest horizontal motion we can do. It is the starting point. The base.

With beginners we are less strict with the 3 goals, and they can do it on the surface. We still enforce the looking down. We encourage the squeezed ears, and the locked thumb..

As we progress through levels we initiate the