TSS Duration Estimator
Intensity Factor Zones
| Zone | Intensity Factor (IF) | Description |
|---|---|---|
| Recovery | < 0.60 | Active recovery |
| Endurance | 0.60 – 0.75 | Long steady rides |
| Tempo | 0.76 – 0.85 | Moderate effort |
| Threshold | 0.86 – 1.00 | Race pace |
| VO2 Max | > 1.00 | High-intensity intervals |