VO2 Max & Resting Heart Rate
Your two key cardiovascular metrics, tracked over time with percentile rankings for your age and sex.
Works with Apple Health
Your body is
keeping score.
You just can't see it - yet. Luen reads your Apple Watch data and connects your VO2 Max and Resting Heart Rate to four daily habits. No logging. No manual input. You live your life. Luen shows you what your body thinks about it.
Download for iOSVO2 Max
Resting Heart Rate
Workouts
Sleep
Daylight
Stress
Features
What you'll see
A clear, honest picture of your cardiovascular fitness - and the habits that shape it.
4 Habits, Zero Logging
Exercise, sleep, daylight, and stress - all tracked automatically from your Apple Watch. Nothing to log. Nothing to enter.
Your Data, Shown Honestly
Luen shows you how your habits and metrics relate - patterns from your own data, not generic advice.
Weekly Patterns
See your consistency across the week. No streaks. No guilt. Just an honest view of what happened.
100% Private
All analysis happens on your iPhone - your data never leaves your device. No account required. No social features. No ads.
Percentile Changes
Track where you stand relative to your age group and watch how your percentile shifts over time.
How It WorksSimple setup,
Simple setup,
clear picture
Connect Apple Health
Grant Luen permission to read your health data. We only read - never write or modify your data.
Live Your Life
Your Apple Watch captures your workouts, sleep, daylight, and stress automatically. No check-ins needed.
See What's Happening
Luen shows you how your habits and metrics connect - patterns that were always there but invisible until now.
Guides
Popular Guides
VO2 Max by Age: Percentile Charts
See where your VO2 Max falls compared to others your age with percentile charts for men and women.
Resting Heart Rate While Sleeping: Normal Ranges
What is normal for sleeping heart rate by age, what disrupts it, and when to be concerned.
What Is Cardio Fitness?
What cardio fitness measures, why it matters for longevity, and how to check yours on Apple Watch.
VO2 Max and Longevity
The research linking VO2 Max to lifespan, the key thresholds, and why it matters at every age.
How to Improve Your VO2 Max
Training methods, realistic timelines, and daily habits that drive real cardio fitness gains.
Resting Heart Rate by Age
Normal ranges for men, women, and athletes, and the habits that shape your number.
Clarity, not motivation.
Luen doesn't coach you. It doesn't gamify your health. It doesn't nag. It gives you something more durable than motivation: clarity.
One-time purchase. No subscriptions. Ever.
Download for iOSSupport
Have a question, found a bug, or want to share feedback? We'd love to hear from you.
Or email us directly at support@luen.app