Underdog — Heart Rate Zones - Showcase Project
Listed August 29, 2026
About Underdog — Heart Rate Zones
Zone 2 training on Apple Watch, scored into weekly leagues
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.
Project details
Website: https://tryunderdog.com