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      <news:title>Stair Climbing Cuts Cardiovascular Death Risk by 39%: The Biophysics of Vertical Exertion</news:title>
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      <news:publication_date>2026-08-16T13:35:56.240Z</news:publication_date>
      <news:title>Why Walking Gets Harder with Age: The Ankle&apos;s Safety-First Trade-Off</news:title>
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