when you step out the door, you're training wrote:
The only reason to not count warm up miles etc is to make it seem like the athlete is doing less. Add it in. It counts.
No! It doesn`t count for the aerobic system to grow stronger. It`s only "junk mileage " if you count it as real training mileage. But the warm up is of course necessary to get ready for fast quality work. And you only need 8-10 min of very slow jogging to get your muscles ready for quality work.