+1 to running. If you run consistently, you'll learn to believe in your body as something that naturally improves if you train it well, and that belief will cross over to your mind and heart.
Indeed, the title undersells it and I'm glad I didn't skip over it, the article is basically an information-dense but approachable summary of audio generation.
+1, had the fortune to work with him at a previous startup and meetup in person. Our convo very much broadened my perspective on engineering as a career and a craft, always excited to see what he's working on. Good luck Simon!