I have been carrying my Fitbit One for a little over two years with me and it keeps tracking my daily steps. It also tracks my distance covered by multiplying those steps using the stride length which you can either provide explicitly or implicitly setting your heights. In the winter of 2012 I bought my first ~Garmin Forerunner 410~ (replaced by a Garmin Forerunner 920XT) GPS watch to help me track my running (and other outdoor) activities.
Recently I ran the St. Pat’s 10 Miler in Atlantic City, Nj. It was my first official running event ever and I enjoyed it lot. Shortly after the race the official results have been posted on the Internet. The data did not only include the number and times of the participants but also gender and age. Looking at the finisher time distribution it shows that most runners finished at around 90 minutes: