Free tool
Heart Rate Zones
Five zones, in beats per minute. Age gets you an estimate; add a resting heart rate and we'll use heart rate reserve, which is better. A lab test is best. You probably don't need the lab.
Most of your running belongs in Zone 2 — the one that feels too slow. If you could hold a conversation, you're doing it right. There's nobody to converse with. That's the point.
Want the training to go with the numbers?
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