Welcome to reThrive. We help you understand how you're aging biologically and what to do about it, so you can live longer and healthier.
What reThrive measures
Most health apps tell you what you did yesterday. reThrive tells you what it means for your longevity.
True Age
Your biological age based on four biomarkers: VO2max, resting heart rate, heart rate variability, and lean body mass index.
If you're 45 but your cardiovascular fitness, heart metrics, and muscle mass match those of a typical 40-year-old, your True Age is 40.
Pace of Aging
Whether your True Age is improving, declining, or holding steady over time.
A Pace of 1.0x means you're aging at the same rate as the calendar. Below 1.0x means you're rejuvenating. Above 1.0x is your signal to course-correct.
How it works
reThrive connects to your wearable devices through Apple Health to track the four biomarkers that predict longevity:
VO2max: Cardiovascular fitness
Resting heart rate: Heart efficiency
Heart rate variability: Stress resilience
Lean body mass index: Muscle mass
We combine these into a single True Age score that updates every Monday based on the previous 4 complete weeks of data.
What you need
An iPhone running iOS 16 or later
A wearable device that syncs to Apple Health (Apple Watch, Oura, Garmin, Fitbit, Whoop, or similar)
Consistent biomarker data: 4+ days of RHR/HRV readings and at least 1 VO2max and 1 LBMI reading across 4 complete weeks
Four weeks of True Age measurements to see your Pace of Aging