What recovery scores are built from
Overnight HRV, resting heart rate and sleep, each compared with your own recent normal. Apple Watch measures all three and saves them to Apple Health.
What you need on top
A score that reads those numbers against your baseline, a daily strain or training load, and advice for today: train hard, go easy, or rest.
How Life OS does it
Life OS reads Apple Health, scores your readiness every morning, tracks training load through the day, and its ELO tells you what that means for today's plan. No second wearable.
Questions people ask
Can Apple Watch replace Whoop?
For recovery and sleep, largely yes: it measures HRV, resting heart rate and sleep. You need an app that turns them into a daily score and advice.
Does Life OS need extra hardware?
No. It works with iPhone alone and goes further with Apple Watch.