KNOW WHEN TO PUSH. KNOW WHEN TO REST.

DAILY HRV-BASED READINESS ANALYTICS FOR ENDURANCE AND HYBRID ATHLETES.

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Readiness Score
0
HRV 68 MS SLEEP 7.5 HRS RHR 52 BPM
Training Zones
Recovery Standby
Conditioning Active
Overload Standby
HRV Trend
68 MS
MONTUEWEDTHUFRISATSUN
[ 01. PHYSIOLOGY ]

Radical Transparency of your Nervous System.

Grain monitors the autonomic nervous system through millisecond-accurate heart rate variability tracking, giving endurance and hybrid athletes a clean signal on whether to push, hold, or recover.

[ DATA_STREAM ]
Sample Rate1000HZ
Metric Accuracy99.2%
Analysis ModeRMSSD
VIEW SPECS
[ RACE HEALTH SCORE ]

You trained for 16 weeks.
You got sick 4 days out.

It's not bad luck. HRV drops 48–72 hours before symptoms appear. Grain detects the signal before you feel it — and tells you what to protect.

OPEN WINDOW TAPER PARADOX HRV EARLY WARNING
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Built for the 1%.

Grain does not offer encouragement. It offers raw, interpretable biological data so athletes can stop guessing and start adjusting training load with intent.