I just started running a little over a month ago. Well, running again-I used to run in high school, but I have since had kids and gotten old. I usually run on the treadmill because I have one available at my office building. It's also good for my OCD so I can keep track of my speed and distance easier, and it helps me keep a decent stride. As for running outside, I ran on a path a few weeks ago and rolled my ankles pretty bad. I can run outdoors on a track or on pavement that's pretty level. I'm a wee bit of a wuss, so I try to run in a controlled environment.
Also, I'm on the treadmill every morning before work and every afternoon after work-it replaces my cigarettes, and I find myself moving whenever I feel like smoking.