Fitness Biomarker
VO2 max and cardiorespiratory fitness: what the number means
VO2 max is a cardiorespiratory fitness marker connected to heart health, exercise capacity and aging-well routines.
Key Takeaways
- VO2 max estimates how much oxygen your body can use during intense exercise.
- Cardiorespiratory fitness is strongly associated with health outcomes in population research.
- Agefully combines VO2 max, steps, workouts, resting heart rate, strength and mobility when data is available.
What VO2 max tells you
VO2 max is commonly used as an estimate of cardiorespiratory fitness: how well the heart, lungs, blood vessels and muscles support sustained activity.
The American Heart Association has argued that cardiorespiratory fitness deserves more attention because low fitness is associated with higher risk of cardiovascular disease, all-cause mortality and several other adverse outcomes.
Why Agefully does not use one fitness number alone
Fitness for aging well is broader than endurance. The app also tracks strength sessions, cardio work, steps, mobility and resting heart rate so the plan supports capability, not only a performance metric.
CDC guidance for adults includes both aerobic activity and muscle-strengthening activity. That is why Agefully keeps workouts, steps and muscle-focused training visible together.
What users can do this week
Aim for a repeatable walking or cardio habit, then add strength work at least twice a week when appropriate for your ability.
Use VO2 max as context, not a verdict. If Apple Health provides it, Agefully can include it in the fitness pillar; if not, workouts and steps still give useful signals.
How Agefully Helps
Turn the science into a daily plan.
- Imports compatible Apple Health steps, workouts, active energy, resting heart rate and VO2 max.
- Suggests workouts that include strength, walking, cardio, mobility, balance and bone-focused sessions.
- Shows fitness as one pillar inside the broader Aging Well Index.