Lag of the clubhead is an important benefit to releasing the club late in the swing and with power. Drill 4 is one of the training protocols in allowing our body to do such a thing.
The swing is an arc from an above and inside the ball view. The clubhead should travel along the target line for a few feet before it starts arcing back to the inside. Here is a drill to help achieve that.
The drifting and grabbing of the right foot is something I have discussed for over 15 years now and yet still most people do not understand it or know the pressures that help create it.
I have always talked about the similarity of baseball and golf motions. The only difference is the ball sits or is thrown in a different area relative to the ground level.