Underdog — Heart Rate Zones

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Underdog tracks heart rate zones automatically on Apple Watch and turns Zone 2 work into points.Zone 2 is the low-intensity band most endurance plans are built around, and the part people skip because it feels too easy to be worth logging. Underdog scores it — time in zone earns points, and those points put you in a weekly league with friends, promoting and relegating you through tiers from Bronze to Diamond.Zones are detected from the watch automatically, so there is nothing to start or stop mid-session. Free on iPhone.