I have seen many people out doing their usual jogging or walking exercises, and in one of their ears is an earplug that transmits music from a Lecteurs MP3 to pass the time while they exercise. I assume that they need this diversion to the fact that they are walking or jogging to help them pass the time. I would want to keep the sounds of my surroundings fresh in my ears in order to know whether or not I was being followed too closely. You never know when there might be a person, who you don't want to associate with that might be right behind you.
