Blog
30-second chair stand test score chart: norms by age and protocol
Use the 30-second chair stand test score chart, protocol, and age norms to measure leg strength, fall risk, and progress safely at home without equipment.
Aging after 60: the 5 health markers that matter most
After 60, walking speed, grip strength, balance, VO2 max, and cognition reveal functional aging. Learn how to measure and improve each marker.
Apple Health mobility metrics: complete guide to walking data
Apple Health mobility metrics explained: walking speed, step length, asymmetry, double support time, steadiness, stair speed, and trend changes.
Apple Watch gait metrics explained: walking asymmetry, steadiness, and double support time
Understand every Apple Watch and iPhone gait metric including walking asymmetry, steadiness, double support time, and step length. Learn what normal values mean.
How to test your biological age at home: 5 simple tests anyone can do
Test your biological age at home with 5 validated physical assessments. No blood work, no lab visits — just your body, a timer, and 15 minutes.
Biological age vs chronological age: what's the difference and how to measure
Understand the difference between biological and chronological age, how biological age is calculated, and what you can do to lower yours backed by science.
Blood pressure by age chart: normal ranges for men and women
Complete blood pressure chart with normal ranges by age and gender. Learn what your systolic and diastolic numbers mean and when to take action.
DEXA scan vs bioimpedance: which body composition test is most accurate
DEXA is best for baseline body composition and bone density; BIA is best for frequent trend tracking. Compare accuracy, cost, limits, and when to use each.
Double support time by age: normal ranges chart and what high values mean
See double support time by age with practical normal ranges, Apple Health context, trend interpretation and signs worth discussing with a clinician.