p · Physical Vitality
The exponent of the body. What multiplies the work.
Movement. Cardiorespiratory fitness. Strength. The axis the world has measured the longest.
Definition
What this axis measures.
Aerobic capacity, muscular strength, daily movement. Measured continuously by wearables and clinical assessments.
Signals
The data that feeds it.
VO2 max trend
Quarterly assessment, year-over-year delta.
Daily movement
Steps, minutes, weight-bearing time.
Strength progression
Compound lifts, grip strength, balance.
Recovery from load
Days to baseline after a hard session.
Where it sits
In the equation.
CH = (S × Sp)C × (T + E)p × (ER × RS)(C/3)
p is the exponent on (T + E). Higher p multiplies adherence and emotional regulation. The strongest single predictor of all-cause longevity in the equation.
Science
What we lean on.
VO2 max is the most-validated single longevity predictor in human research. Strength training mediates fall risk, metabolic health, and emotional regulation simultaneously.
All eight axes