[Bagger Lance]

This topic is perfect here and can be expanded in the Advanced thread.
Like just about everything in TGM, the waggle has a distinct purpose. It is the exact reheasal of your motion into and through impact. There are actually two types of waggles; Address waggle and Start Down waggle.

To answer your question, you most definately practice and preview your selected hinge action during the "waggling". The best way to do this is OVER the ball so you can see the line of the clubhead and the hinging action of the clubface.

Not only are you visually previewing impact, you are also "pre-recording" the feel of the impact alignments.

Hope that gives you a "waggle" of what's ahead of you as you dig in and start understanding The Golfing Machine!

Bagger