Originally posted by noticingthemistake
See with that i would slide up from the 12th fret and play the 16th with the index finger and the 19th with the pinky. Granting that the rest of the sequence would be in the 16-19 range. If not I would just play it as...

No, dude, you're missing the point. That goes 12-16-19 all the way up and down the strings. It's a finger stretching exercise. Of COURSE it can be played in an easier fashion, but then it wouldn't be a very good exercise now would it?