OK, I'm worried about the weather.
We've had a reasonably cool spring. Yesterday morning was just about perfect for a run. We actually got a bit of frost overnight. When I left the house at around 5:00 am, it was still in the low 30's. By the time I was finished, it was low 50's, at best.
So what am I going to do if the next three weeks usher in summer? It's hard enough to run in the heat, but it's twice as bad if you aren't acclimated. If May 30th dawns 68 degrees, and quickly heats up to the 90's, I'll be lucky to finish, never mind run a good time.
I guess I just have to find something to worry about!