Actually attempted a workout today. Did the same 5 mile out and back but did it fartlek style surging between lamp posts. First as a (o = on; r = rest) 1o, 1r, 2o, 1r, 3o, 1r then as a 3o, 2r. It was good to mix it up. No deer during the run but I did see one while in the car on my way home.