Adam Levin's rule for writing

Chicagoist: What’s one thing about writing that’s really impossible to teach?
Adam Levin: How to sit well. I get these killer students, these talented, hardworking, every-teacher's-dream-type students, and I go, "Write perfect sentences over and over until you arrive at a story," and they do it. I tell them, "Never be boring," and they cease to ever be boring. But then I'll say, "Hey, my back hurts really badly and it's probably gonna hurt for the rest of my life because during the first ten-or-so years that I devoted to writing fiction, I sat all hunched over the keyboard for hours on end every day, so please don't sit like that, okay? Make yourself sit up straight when you work or, at the very least, get up and stretch every twenty minutes," and they give me this look like, "Stretch? What are a stretch?"