Last night I went to bed with pains in my legs. My left knee, back of my left leg etc etc. But I decided that since I wasn't increasing mileage and since I had rested yesterday, I had little reason not to run today.
So I woke up a usual and tried to reduce my 6k time. I ended up doing it in 29:38 and cleared the 12K in 1:00:38.
Now I have no legs.
No injury, just tired, mangled, mangy legs. I suspect that I will do a slow 20K tomorrow. I met about 5 runners today.