I thought this would be a great question to answer since I get a lot of comments on YouTube about why I play power chords using my index finger and pinky most of the time.
The reason I do it is because is allows me to keep my wrist relatively straight and with my fingers at a 45 degree angle, the guitar neck fits into my hand very comfortably. This creates a nice balanced when moving the hand up and down the fretboard, both directions are equally easy. If you don't have a proper position, you will usually find that moving up the fretboard towards the picking hand is easier than moving down the fretboard towards the headstock.
I hope this helps you nail those power chords with ease Alexis!
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