Dailymile will appeal to those looking for a way to track their workouts and draw motivation from its social features. While it offers some fun--and useful -graphing features, dailymile is for true extroverts only. If you'd like to keep some of your workout info away from prying eyes, you may be better off with a site like FriendFit. It offers some similar social features, but manages to guard your privacy at the same time.