Zone 2 is 60-70% of max heart rate — the easy endurance zone where you can still hold a conversation. Long runs there build aerobic base.

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Heart Rate Zones Calculator

Five training zones — recovery, endurance, tempo, threshold and max — based on your max heart rate.

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Frequently Asked Questions

What is zone 2?: Zone 2 is 60-70% of max heart rate — the easy endurance zone where you can still hold a conversation. Long runs there build aerobic base.