Training Load
Applicable to all workout modes
Training load evaluates if the past training is reasonable to the user and helps avoid excessive training and fatigue. Use the training load data as a reference when adjusting the intensity and duration of your training. It is always recommended to listen to your body if the training load says otherwise.
| Level | Load Description |
| 0-40 | Under-training |
| 41-60 | Low |
| 61-100 | Optimized |
| 101-120 | Excessive |
Fitness Index
Applicable to outdoor running modes only (Run, Trail Run, Track Run, Hike)
- VO2 Max
- VO2 Max is the maximum amount of oxygen your body can utilize during training. A higher VO2 Max reading generally means a better fitness level. COROS watch uses heart rate and other data to provide a fairly accurate estimate of VO2Max compared with lab results.
- Lactate Threshold
- Lactate threshold is the breaking point when aerobic training starts to transform to anaerobic. It can also be defined as the intensity of exercise at which lactate begins to accumulate in the blood at a faster rate than it can be removed. It is a common indicator used in competitive sports to evaluate training loads and fatigue level.
- Threshold Pace
- Lactate threshold pace is the fastest pace at which the body doesn't accumulate lactic acid significantly in the blood during the workout. Running at this pace is a great way to build up aerobic fitness and train for longer distance.
If some or all of the fitness index isn't displaying on the COROS app, please ensure the following prerequisites are met. Easy runs don't provide enough data to generate these metrics.
- Complete at least 3 outdoor running workouts.
- Heart rate is in zone 3 or above for over 30 minutes for each workout.
If you have doubts about the accuracy of the fitness index, please check first if you have set up the resting heart rate and maximum heart rate correctly on the COROS app.
Fitness Level
Applicable to outdoor running modes only (Run, Trail Run, Track Run, Hike)
Fitness Level is a fitness and endurance evaluation metric. It is the result of a combination of VO2 Max, lactate threshold and workout efficiency. It also indicates your performance level.
The relation between the heart rate performance and pace greatly impacts the fitness level. If you run faster with a similar heart rate performance, the fitness level will increase. If your overall heart rate is higher at a similar pace, the fitness level will decrease. Training with heart rate chest straps or armbands are highly recommended for the best results.