Last week, I had a softball double-header in very cold weather. It didn't help that we played at 8:15 and 9:15. I stretched, I tried to warm up, but somehow I still managed to tweak my left calf. I took the next day off, then felt good about running again. Wouldn't you know it, but dang it, I tweaked the calf again, playing softball last night. I think it's the sprinting and rapid direct changes when I run the bases, because my normal running routine (slow and steady) doesn't bother it.
I did end up going for a shorter run today (two miles) to make sure I don't make it worse. I felt it, but it was all right. I ordered some calf compression sleeves from Running Warehouse which should be here in a couple of days. Hopefully they'll do the trick; even though softball season is almost over, I still worry that one wrong step will really mess it up.