This was given to a guitar student to help them build pinky strength for hammer-ons and pull-offs (legato). This short workout gets harder as you progress through it because you go from using your 1st and 4th fingers to your 2nd and 4th fingers, then your 3rd and 4th fingers.
Here is the Guitar Pro 6 tab for this lesson:
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John Taylor - guitar and bass instructor for Mile High Shred.