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Although I can sympathize with the author's early aspirations to become an accomplished long-distance runner, I feel there's more than a hint of snobbishness in the article.
I grew up in the same small town in Taos, New Mexico where Frank Shorter trained for the Olympics. His parents were medical professionals and were considered real down-to-earth types. It's difficult for me to imagine that Frank Shorter would have felt that running in a marathon somehow made him superior or more elite than your average runner.
I think the author is frustrated by suffering an injury early on in his life that prevented him from reaching his true potential.