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Improving Zone 2 vs Zone 4: Why It Takes More Time
To improve metabolic capacity, spend more time in zone two as it takes longer to make significant improvements in zone four. While improvements in zone two can be seen within two to three months, it takes weeks to see improvements in zone four. Many athletes hit a plateau because they haven't stimulated type one muscle fibers. The 80-20 concept is important in spending the majority of training time in the right zone.