To run, or not to run?

A couple months ago, my husband and I promised each other that we would run in the Pittsburgh Spirit, a half marathon, in November. For a month or so, I trained, I ran and walked and ran some more. But I began noticing how tight my body was getting, and honestly I never liked running in the first place. Then, I started doing yoga every day. My body couldn't feel better, and without the running I'm much more open and less stiff. So I haven't found the motivation to run again. I even have my goals for the summer hung up at work; one says "train for a half marathon." Do I give up my mini dream of being a runner? Is my body telling me to stop or am I merely being lazy? To run, or not to run? That is the question.