Last week I ran a 9K, not particularly long for me, mostly on the flat, but I finished on quite a steep hill with a little sprint when I got up to a flatter bit. Nothing out of the ordinary really. I felt as I usually do that day, but the next day I felt awful! Like I'd been steamrollered! I ached all over and had no energy at all, like someone had pulled the plug and it had all drained away. I expected to come down with a virus the next day, but, no, I was fine...I was absolutely starving though, just couldn't stop eating...that's rare for me, I have a smallish appetite.
What happened? Did I just overdo it? Not eaten enough before hand? Any suggestions? Anyone else had this happen to them?
I have run since, but it's made me a little wary...