Heart Rate Zones: Underdog Apple

Heart Rate Zones: Underdog

Zone 2 Training & Leagues

Features & Capabilities

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 Zone 2. Underdog shows you exactly when you're in the zone.

FEATURES

  • Automatic Apple Watch sync — workouts appear in seconds
  • 5 heart rate zones (Z1–Z5) calibrated to your max HR
  • Weekly leagues: Bronze, Silver, Gold, Platinum, Diamond
  • Points for every Zone 2+ minute
  • Achievements, streaks, and personal records
  • Friend leagues — invite via link
  • VO2 max tracking from Apple Health
  • Works with running, cycling, rowing, hiking, and 40+ workout types

FREE Underdog is free to use. Optional Underdog Pro unlocks unlimited friend leagues, advanced stats, and custom zones.

TERMS & PRIVACY Terms of Use (EULA): https://tryunderdog.com/terms Privacy Policy: https://tryunderdog.com/privacy

Subscriptions auto-renew unless cancelled 24 hours before the end of the current period. Manage in Settings → Apple ID → Subscriptions.

User Growth & Download Statistics

App
By:
Ignas Velza
Rating:
5.00
(3)
Version:
1.5 Last updated: 2026-06-10
Version code:
886711240
Creation date:
2026-03-03
Compatible devices:
Size:
19.27MB
URLs:
Website ,Privacy policy
Full description:
See detailed description
Source:
Apple Apps Store
Data ingested on:
2026-06-12
Compare stats and ranking:

Ranking

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.
Developed by:
Ignas Velza
Apple Apps Store
https://apps.apple.com/lt/app/heart-rate-zones-underdog/id6758392759
Website:
https://tryunderdog.com

Best Heart Rate Zones: Underdog Alternatives

Here are some Apple apps that are similar to Heart Rate Zones: Underdog: