Blog
Muscle mass vs body weight: which predicts healthy aging better?
Compare muscle mass vs body weight for healthy aging. Learn why strength, lean mass, waist size, and body-composition trends beat scale weight after 40.
Strength age vs biological age: what declining muscle tells you
Strength age vs biological age compares muscle function with systemic aging. Learn what declining strength means, where it misleads, and what to track.
Grip strength vs VO2 max: which better predicts longevity?
Grip strength vs VO2 max is not a winner-take-all choice. Compare longevity signals, blind spots, and how to track both without overreacting after 40.
Recovery days after 40: how often should you train?
Recovery days after 40 guide: age-banded training frequency, rest-day targets, and load rules to keep fitness improving without overdoing it each week.
Strength training vs cardio for biological age: which lowers it more?
Does strength training or cardio lower biological age more? Epigenetic clock data, telomere studies, and a head-to-head comparison of how each modality moves your aging biomarkers.
The sitting-rising test: Can getting up from the floor predict how long you'll live?
Learn how the sitting-rising test (SRT) predicts mortality risk. Score chart by age, protocol, and science-backed ways to improve your score for longevity.
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.
Fitness benchmarks by age: how strong, fast, and fit should you be
Age-based fitness benchmarks for cardio, strength, balance, mobility, and body composition. Learn what to test, what matters, and how to track progress.
7 functional fitness tests linked to longevity risk
Seven home-friendly functional fitness tests linked with longevity research: grip strength, balance, gait speed, sit-to-stand, push-ups, VO2 max, and more.