Mental Stress Score
Mental Stress looks at heart rate and HRV while you are nearly still. A heavy squat day does not count as anxiety.
Mental Stress answers: how mentally stressed was I today? It is not workout strain, and it is not called Strain. Hammr replaced the legacy Strain score in 2026.
How a window is classified
Hammr splits the day into 15-minute windows, then looks at heart rate, HRV, and motion:
- Near-still + elevated HR + suppressed HRV → counts as mental stress
- Moving + elevated HR → physical, excluded
- During a workout or the 90 minutes after → excluded
- Low HR + high HRV + still → rest
The daily score averages eligible still windows.
Stress zones
| Zone | Range | Meaning |
|---|---|---|
| Rest | 0–25 | Calm |
| Low | 26–50 | Normal day |
| Moderate | 51–75 | Elevated — a walk or breathing break can help |
| High | 76–100 | Sustained — prioritize rest and hydration |
Home shows the latest awake reading. The Stress tab shows today’s average, an intraday chart, and time-in-zones.
Improve accuracy
Apple Watch samples HRV sporadically unless AFib History is enabled in the Health app. Hammr Settings includes a guide to turn it on for denser readings.
Mental Stress does not replace Readiness or Recovery. It is not a clinical anxiety diagnosis.
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Hammr Fitness is for wellness and fitness purposes only. It is not medical advice. Consult a physician before starting any exercise or nutrition program. If you have a medical emergency, call emergency services.