This is a picking exercise dealing with dexterity. The focus here should not be on the actual fingerings.
Here we want to focus on the picking hand.
This means a downstroke – 
This means an upstroke – 
Sets and Reps
Perform this exercise :
- 3 sets of 20 (rest 30 secs between each set)
This equals 3 sets with a total of 60 reps.
Exercise
Video
Tablature
Ascending
Descending
