If you run slow enough (MAF or lower), you can concentrate on something else. Get a phone/tablet/TV with a Chromecast or Internet access, and get these YouTube videos going. Cat videos are probably fine, but educational ones are better. Have a backlog of videos related to your favorite sport to watch (technique, strategy, etc...)? That's the perfect time to watch them.
You can also use running on a treadmill as a meditation. Concentrate on what you do,etc... (So, the opposite of my first suggestion). Not sure this is the best idea though as my wife is a quite avid meditator (she can stay without moving or thinking for 2 hours and find that pleasurable), and she says that running on a treadmill doesn't work as a meditation for her. However, she is nursing an injury and has to be very careful, so she cannot let the body do its own thing for now.