Thursday: 2.5 miles "the back"

Thursday I went 2.5 miles. I ran 1.25 before my back was hurting too much to keep running. I'm not exactly sure what happened. It could have been from any number (or all) things from the day before. I was throwing frisbee, kicking a soccer ball, swinging a bat, hauling boxes of rocks, moving 5 gallons jugs of water and moving stuff around the garage. I also may have just slept wrong.  Anyway, my back hurt and I took two days off.