Surprisingly, a lot of runners aren't aware of the rules of the track. If you're a slower runner logging an easy run or taking a recovery break from an interval workout, you should move to one of the outer lanes to prevent a collision with faster runners. Conversely, if you toe the line to do a workout (repeat miles, for example) try to run in the inner lane as much as possible. Running in lane 4 versus lane 1 will add approximately 100 meters to your mile; and if you run in lane 8, that will add over 200 meters. That adds up if you're trying to hit a specific time.