The warming climate is forcing marathons to consider changes to keep runners cool

DES MOINES, Iowa (AP) — Paul Grinvalds has completed 114 marathons in all 50 states, but he still wilts when he races in temperatures beyond 60 degrees Fahrenheit (15.5 Celsius). It’s the same for most runners, as the body can’t cool down during exertion, and heat makes that even harder. “One thin...

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