Dear Couch-to-5K App (Epistolary Wednesday, September 10),

Dear Couch-to-5K App,

There's so much promise in your description--a simple hyphenated identifier that links lethargy and weakness to domination and endurance. Do you know I've been trying to master you, or something like you, for fifteen years? Before that, in high school, I never really even tried to run. I was the kid with the doctor's note and the in…