Define runner. I skimmed the article and didn't see it. Maybe I missed it. Some runners train for long distances - marathons or longer. At the opposite end of t

Define runner. I skimmed the article and didn't see it. Maybe I missed it. Some runners train for long distances - marathons or longer. At the opposite end of the spectrum are the sprinters who train for a short burst of maximum speed. And there are competitions for many distances between these extremes. It wouldn't surprise me if difference between these extremes were as great or greater as those between runners and swimmers.