Open Bass Strings
Here are the open strings. We often play these with the thumb so we will briefly look at the thumb technique.
As with the i (index) m (middle) and a (ring) fingers the thumb can play both free stroke and rest stroke. In the upcoming exercises we will concentrate on free stroke for the thumb.
Use the large join of the thumb and create a circle pushing the string down and then letting go by swinging out.
Have a look at the video below and copy the technique: