Heart Rate Zones group intensity to guide cardio training.
| Zone | % max HR | Feel and purpose |
|---|---|---|
| Z1 | 50%–60% | Easy, recovery, base building |
| Z2 | 60%–70% | Comfortable, aerobic endurance |
| Z3 | 70%–80% | Moderate, tempo |
| Z4 | 80%–90% | Hard, threshold |
| Z5 | 90%–100% | Very hard, short efforts |
Device‑specific definitions may vary slightly.
Interval Training alternates hard efforts and easy periods to build speed and fitness.
Wearable Metrics capture activity and recovery data that inform daily plans.
Calorie Burn Estimation predicts energy use during activity from heart rate, movement, and models.
