I am an upcoming junior and where I live there are thunderstorms most of the time and I am training for a sub 17 5k. Is this possible with me being forced to do around 50% of my mileage on a treadmill? When I run on a treadmill I run the same paces as I do outdoors and on a 2% incline. If it helps my mile PR is 4:55 and two mile PR is 10:45.