Are My Heart Rate Zones Wrong? A Nose-Breathing Experiment

I recently wrapped up a 120-minute treadmill run that was, by all accounts, a success. I felt energized, fueled, and strong from start to finish. But something curious lingered in my post-run reflection: while my heart rate data suggested I was working above Zone 2 for extended stretches, I was able to comfortably breathe through […]

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Heart Rate Training, Self-Experimentation, Zone 2 Running