[6bmike]

I have watched the TT video's many times and have enjoyed them
thoroughly. I just don't get LEFT ARM SWINGING ?

Left arm swinging is the pivot- power accumulator four- whirling the clubhead from the primary and secondary levers (left arm and club). It is the basic most common way to throw the clubhead. Pull and release. From the right to the left. A left arm swing slaps the vertical wall (plane) with the back of their left hand- hard and fast.

A right arm also pulls but the pivot is more like a hitters making the pull short and turns into a sidearm throw in front of the body.
A right arm swing slaps through the ball hitting the vertical wall (plane) with the palm of their right hand- hard and fast.