Studied all day for my statics midterm, did a LOT better than I thought I would. Ran afterward and a quarter of a mile in it felt like I'd been shot in the back. I almost fell onto the cement but caught myself, and hunched over for a couple minutes, but the pain didn't go away that much. Did something dumb and kept running to see how it faired but surprisingly it faded. Def still hurts to move/breathe too deeply now that I'm typing this though. Maybe I tweaked my back. Maybe it's from running on the pavement yesterday when I normally do soft surfaces only.