Recovery is not a single score
A readiness or recovery score is an interpretation of several inputs. It can be useful as a prompt to check in with yourself, but it cannot fully capture fitness, fatigue, injury risk, life stress, or your goals.
Common inputs
Consumer systems may combine heart rate variability, resting heart rate, sleep-related estimates, recent activity, and personal logs. Methods differ between products, so scores from different devices are not directly interchangeable.
Make the decision with context
Use a trend as one input alongside perceived effort, soreness, mood, and coaching or clinical guidance. A wearable should not overrule severe symptoms or professional advice.
A note on health information
This article is for general education, not medical advice. GRND is not a medical device. For symptoms, diagnosis, treatment, or urgent concerns, contact a qualified healthcare professional or local emergency service.