Friday, January 20, 2012 (20 minutes)

20 minutes into the run, I suddenly pulled a muscle in the middle of the left side of my back. Nothing in particular triggered it. I just felt it pull out of nowhere. This has happened to me a few times before. It generally means I need two to four days off. I can't really exercise at all right now, since even a deep breath aggravates it. I wish I knew what was behind this.

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