JENNA SAYS...
The way Paul grinned the first time he played a powerchord, I knew we had to do some metal riffs! I had fun recording the audio example, trying to make all the chord shifts clean and to hit the notes hard without accidentally playing open strings. Even now I still feel I could play it better! Hopefully that means Paul will never get tired of practising this stuff.
The hardest part for Paul has been developing the stretch between first and third fingers to play powerchords. Descending powerchord riffs work well for this because the frets get wider as you move down. Find a fret position where the shape feels comfortable, then move down one at a time. Stop when it gets uncomfortable. If you do that every day, you’ll find your finger stretch increases quite quickly.