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 thing about marathoners is typically we're kind of stubborn,” said Grinvalds, 68, from West Des Moines, Iowa, who finds even temperatures in the 50s F (10 C) a bit warm. “So if we have a goal and...
Read MoreThu, 13 Aug 2026
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