So I'm stuck on week 4 right now. I've attempted it twice and both times I've gotten through the first 5 minutes run, but then my asthma kicks in and I can't finish the second half as instructed. And once I'm toast, I can really run more than 90 seconds or so without switching to a walk. From what I've gathered in here, my best course of action is to repeat the run until I can complete it; but I'm wondering what's the best way to do the run wrong. Should I just keep doing the week 4 run until I go off the rails and then run/walk as best I can? Or would I be better off going back to week 3 another time or two until I'm more comfortable there? (I finished week 3, but it was tough.) I considered maybe doing week 3 again and trying to bump at least one of the 3 minute runs to 5 minutes too. I'm new to running, so I'm still learning the magic-run-math-to-build-fitness thing.