Many wearables now greet you each morning with one number that claims to say how ready you are to train. A readiness score is a summary, not a measurement. It combines several signals your device collected overnight and over the past few days, then compares them with your own normal range.
What Goes Into the Score
- Heart rate variability (HRV): higher than your normal usually means your body is recovered. Our HRV explainer covers the basics.
- Resting heart rate: a value above your baseline can point to stress, poor sleep, alcohol or illness.
- Sleep: duration, timing and how much deep and REM sleep you got.
- Recent training load: hard sessions in the last few days lower the score.
- Skin temperature: some devices factor in changes from your baseline.
What Each Brand Calls It
| Brand | Score Name | Main Inputs |
|---|---|---|
| Garmin | Training Readiness, Body Battery | Sleep, HRV status, recovery time, training load |
| Oura | Readiness | HRV, resting heart rate, temperature, sleep, activity |
| Whoop | Recovery | HRV, resting heart rate, sleep, respiratory rate |
| Fitbit and Pixel Watch | Daily Readiness | HRV, sleep, recent activity |
| Samsung Galaxy Watch | Energy Score | Sleep, activity, heart rate data |
Some of these features need a paid plan, depending on the brand. Apple Watch does not show a single readiness number, but it shows overnight trends in the Vitals app and training load in the Activity app.
Why Baselines Matter
Scores compare you with yourself, not with other people. That is why a new device needs one to three weeks before the number means much. During that time it learns your usual HRV, resting heart rate and sleep. If you wear the device only some nights, the baseline takes longer to settle and the score jumps around more.
How to Use the Score Well
- Check how you feel first, then look at the number.
- Treat a low score as a reason to ask why, such as late meals, alcohol, stress or a short night.
- On low days, swap a hard session for an easy one rather than skipping exercise entirely.
- Watch the weekly trend. Several low days in a row are more meaningful than one.
Sleep has the largest effect on most scores, so our guide on how wearables track sleep stages helps you read that part.
Limits to Keep in Mind
A readiness score cannot see muscle soreness, mood or a deadline at work. It also cannot tell the difference between a hard workout and a stressful day, since both raise heart rate and lower HRV. Use it as one input, not a rule. If you feel great and the score is low, a normal workout is often fine. If you feel unwell, rest regardless of the number.
Final Thoughts
Readiness scores turn complex overnight data into a simple nudge. Give your device time to learn your baseline, wear it every night and focus on trends. Paired with how you feel, the score helps you plan smarter training weeks. For more on recovery tracking, see our list of recovery trackers and our guide to wearable features.
FAQs
Why is my readiness score low after a good night of sleep?
Other inputs may be pulling it down. A hard workout, a raised resting heart rate or low HRV can lower the score even after a long night.
How long does a readiness score take to become accurate?
About one to three weeks of nightly wear. The device needs time to learn your personal baseline.
Should I skip training when my score is low?
Not always. Consider an easier session, and rest only if you also feel tired or unwell.
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