Fitness
Strength, capacity and durability — the physical signals that track most strongly with a long life.
VO₂max is the strongest single predictor of all-cause mortality — beyond most blood biomarkers — and Garmin's Firstbeat estimates it within ~5.7% MAPE. Grip strength and lean mass guard against sarcopenia and track with lifespan; progressive-overload logging and lactate-threshold (LT2) demarcation precision-tune training zones. The build target: AI-driven adaptive workout prescription keyed to each day's readiness score.
What we track
| Marker | Captures | Target |
|---|---|---|
| VO₂max | Cardiorespiratory fitness | Top 25% for age |
| Grip / lean mass | Sarcopenia resistance | Rising or held with age |
| Progressive overload | Strength trajectory | Steady week-over-week |
| LT2 | Training-zone precision | Rising threshold |
VO₂max above all
VO₂max is the strongest single predictor of all-cause mortality — beyond most blood biomarkers. Garmin's Firstbeat estimates it within ~5.7% mean absolute error from the wrist. Grip strength and lean mass guard against sarcopenia and track directly with lifespan.
The build target
AI-driven, adaptive workout prescription keyed to each day's readiness score — the member executes, the system plans.