In my dreams, I run

I took a week off from the gym last week because I was sick, and I went back tonight. I'm already sore. Ever since I started working out, I dream about doing physical things I can't do when I'm awake - nothing as awesome as flying dreams, which many people have, but now I have running dreams. This past week, I had such a vivid dream about running that I started crying when I woke up and realized that I can't run.