Heart Rate Zones: Underdog — ASO

By Ignas Velza on AppTrack Ninja.

Zone 2 Training & Leagues

Underdog turns your Apple Watch heart rate data into a game. Every minute you spend in Zone 2 — the sweet spot for endurance and fat burning — earns you points. Compete in weekly leagues with friends and climb from Bronze to Diamond. No manual logging. No ads. Just open the app once and your workouts sync automatically from Apple Health. WHY ZONE 2? Zone 2 training (60–70% of your max heart rate) is the foundation of every elite endurance program. It builds your aerobic base, improves VO2 max, and burns fat — without burning you out. The catch: most people train too hard to actually be in Zon…

Categories: Health & Fitness, Sports

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