Training across a wide spectrum of intensities is crucial to optimize factors for endurance athletes. Traditionally, athletes spend about 70% of their training time at low intensity, around 60-82% of their heart rate peak. Another 20-25% of time is focused on moderate intensity, approximately 82-90% of heart rate peak. The remaining 3-6% is dedicated to higher heart rate zones, above 92-93%. While specific percentages may vary in scientific papers, sticking to this rough guideline can effectively enhance VO2 max.

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