In 2011 I started running on a treadmill at the gym. I was only running a couple of miles a few days a week. I was also running pretty slowly. But this was the beginning of running regularly. It was the beginning of my transition from someone who runs to a runner. That happened years later, but this is where it started. I started using an app called Runkeeper. When you run on a treadmill, you have to enter the miles into the app manually. Later when I started running outside, it tracked the miles by GPS. I have now tracked 4,000 miles of runs with the app. That’s a lot of miles. A lot of running shoes, broken headphones and a lot of sweat.