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What Is Zone 2 Cardio, and How Do I Actually Do It?“Zone 2” is a term drawn from the five-zone system of heart rate training, and the same concept is also known by other names and metrics. To runners, it is “easy pace” or “long slow ...
You can’t trust the heart-rate zones on treadmills or other exercise equipment, since Dr. San Millan’s six-zone system is one of several different classification systems, each with different ...
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