(As always, advice welcome.) I've re-injured my left lats, most likely from bicep curls. Last time I did this was 12 years ago and I couldn't run for 6 weeks, which of course were the 6 weeks immediately prior to the Boston Marathon. This time it's immediately before my Christmas break, during which I was hoping to get in some serious mileage.
It isn't as bad as it was before so I'm going to continue trying to run but pay attention to it. A 14 miler the day after the injury didn't seem to exacerbate it. But DAMmit. I'm starting to wonder if there's something about anticipating vacations that makes me hurt myself!