This lesson elaborates on the basic technique by adding an alternating bass note to the basic pattern.
This note is the low G found on the bottom string and replaces the C note
on the third beat of each bar - in the video I explain how I get that note,
but if you can play the alternative open C using all 4 fingers as in the diagram
you can achieve the same effect without having to move your left hand.
It is not a bad idea though to get your left hand moving as part of the rhythm.