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

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?

Copyright 2026 NPR

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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