Where do marathoners hit the wall? Per-5K splits from 31,655 Boston 2014 finishers show pace holds flat to ~30 km, then slows sharply - 15% median late slowdown.
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Jun 30, 2026 - HTML
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boston-marathon
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How much does heat slow a marathon? Across 14 Boston Marathons, the field median rises ~1 min per degF (r=0.86) - a hot day costs the typical runner ~31 minutes.
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Jun 30, 2026 - HTML
Coaches preach the negative split. Across 31,912 Boston 2014 finishers, only 2.5% ran one - the median runner slowed 14%. A data story on how marathoners really pace.
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Updated
Jun 30, 2026 - HTML
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