What does marathon training do to your body? A reporter becomes the test subject

NPR | By Elissa Nadworny ,

Janet W. Lee, Matt Ozug, Henry Larson

Published October 4, 2026 at 5:57 PM EDT

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Before running the New York City Marathon, NPR's Elissa Nadworny gets a bone scan, blood work and a treadmill test to settle a question from Mom: Is this bad for my body?

Health & Safety

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Elissa Nadworny

Elissa Nadworny is an NPR Correspondent covering higher education. She previously covered reproductive rights and abortion.

Janet W. Lee

Matt Ozug

Henry Larson

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What does marathon training do to your body? A reporter becomes the test subject

Support quality journalism, like the story above, with your gift right now.

Support quality journalism, like the story above,
with your gift right now.