As soon as I started warming up every currently moving part of my body cussed at me. As if an "All Systems Failure" light should come on, my hips, knees, calves...you name it...were unhappy all at once. But just like when you're driving, I kept walking and they simmered down.
I noticed that my calves felt tight around the same place in my run that they did Monday. I stepped off a curb and there they were. Note to self - don't be running and step down a curb. Maybe that will make for a happier Friday run. Who knows.
If you're doing the C25K too, keep at it! We're doing a great job :)