How it works
Mechanism evidence: human
At a glance
What it is, why people use it, the evidence, and what to know before trying it.
Why people use it
- Training-load and sleep trend tracking.
- Resting heart-rate and heart-rate-variability trends during rest.
Evidence at a glance
WHOOP can be useful for consistent training and sleep trend tracking. Its raw nighttime heart measures have validation data, but proprietary readiness scores should guide reflection rather than dictate medical or training decisions.
Confidence: moderate
Device safety
Placement, electrical-device and medical precautions from the manual and reviewed sources.
Recovery and strain scores are not diagnoses and can be distorted by fit, motion, illness, alcohol, medication or algorithm changes. Skin irritation, privacy and compulsive score-checking are practical risks.