Should we all strive to be marathoners? | Chen Jimin/China News Service/VCG/Getty Images If 2025 proved one thing, it’s that Americans’ interest in maximal fitness is higher than ever.  Participation in running races broke records. The New York City Marathon in November had almost 60,000 finishers, breaking the previous year’s record by several thousand, and ultrarunning events, which involve running longer-than-marathon distances, recorded historic participation levels. Meanwhile, extreme workout regimens are going viral. That includes 75 Hard, which dictates 75 consecutive days of d...

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