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Now think of a sprinter or track star...

They're lean right? Very lean! Yet they don't do aerobic training at all.

They train fast. They train intensely. They incorporate strength work.

Their sessions are short.

Actually, their sessions are very, very long. I've participated in track and field my whole life and never is a session short. Distance runners are much leaner than sprinters anyway. Distance runners have long workouts. Sprinters have shorter intervals, and they're more buff. The amount of calories burned in a workout is much more than the calories "retained" by the amount of cortisol released. I'd like to see a picture of this guy who wrote the article, or see his own experiences with running, if any.