Had some calf pain(not achilles) during my second run on Wednesday. I rolled it out and found a huge knot so hopefully it wasn't anything big. Took all of yesterday off, going to do some biking tonight and if the leg feels good, run a few miles tomorrow. I can't feel the pain anymore, even when I flex/stretch, so that's good. Just a minor hiccup, I've had one every time I build up mileage since I joined the blog. Might have more but as long as I listen to my body and shut it down quick like I did with this I should be fine.