🧪 The 8 tests
Enter your result in each test to see how you compare against age-normed reference values. All scoring is per-test — no misleading composite.
📊 Your Summary
Results appear as you fill in each test above. Each metric is scored independently.
Why no single "biological age" score? Combining unequal tests into one number triggers Goodhart's Law: people optimise the composite (e.g., practising sit-and-reach) instead of improving the health domains that matter most. Push-up count and VO₂max carry far more mortality weight than flexibility, yet a composite would let a good stretch score mask a weak heart. Each test here stands on its own so you can focus your training where it counts.