Anyone with more than a passing interest in endurance sport or professional sport will be aware of the numerous metrics available to athletes and coaches to help guide decisions about readiness for training, examples include:
- Whoop
- Oura
- Garmin Body Battery
- Garmin Performance Score
- HRV4Training
A consistent aspect of these are that they are 'closed' systems. You need to use (and pay for) either a propriety app or device, and it is difficult to incorporate data or metrics from other platforms, most importantly actual training load.
Plenty or 'open source' metrics have existed for a long time that also have been used for assessing 'readiness for training', for example:
- resting Heart Rate
- Heart Rate Variability
- Training Stress Balance
- Workload Ratio
The Z2H app is currently being prototyped.
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