Hot Take: Marathon Training is Simple. This is All You Need to Finish Strong.

Robin Arzón has run 27 marathons and is training for number 28, her ninth New York City Marathon. After a five-year break from marathon running—during which she had a daughter and shifted toward hybrid training—she returned with a stripped-down perspective. Her central claim is that marathon training is simple, not easy, and that runners overcomplicate it. In this episode, she lays out ten rules she considers sufficient for finishing strong, along with gear recommendations and answers to listener questions about sleep and soreness.

Easy Days Easy, Hard Days Hard

The most common mistake runners make is spending too much time in the "gray zone"—zone three heart rate work that feels hard but doesn't produce the adaptations of either true easy running or true hard work. Arzón explains that easy runs in zone two build mitochondrial density and aerobic base, while hard sessions like tempo runs, hill repeats, or speed work create the stimulus for performance gains. Gray-zone running fatigues the body without moving the needle for endurance. Her rule: easy days should actually be easy, and hard days should actually be hard. She approaches her current training cycle almost as a newbie, refusing to get "too big for my britches" and simply executing whatever the plan calls for that day.

Lift Heavy, Don't Choose