How to Measure Your Cardio Fitness (And Improve It)
Cardiovascular fitness — how efficiently your heart and lungs deliver oxygen to working muscles — is one of the strongest predictors of health and longevity. Measuring it lets you track meaningful improvements over time.
Ways to measure cardio fitness
- VO2 max (estimated by many smartwatches)
- Resting heart rate (lower generally = fitter)
- Heart rate recovery after exercise
- A timed run or walk test
- How quickly you can climb stairs without breathlessness
Resting heart rate is simple and telling
Measure your heart rate first thing in the morning. As your cardio fitness improves, your resting heart rate typically drops — an easy, free marker of progress you can track over weeks and months.
See Your Progress Clearly
Log weight, measurements and PRs, then watch your progress come alive with visual analytics — free on your phone.
How to improve it
Combine plenty of easy, steady-state cardio (Zone 2) to build your aerobic base with occasional high-intensity intervals to push your ceiling. Consistency over weeks is what drives real cardiovascular improvement.
The takeaway
Track your cardio fitness via resting heart rate, VO2 max or timed tests. Improve it with a mix of easy steady cardio and intervals — your heart is a muscle that responds to training.
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See Your Progress Clearly
Log weight, measurements and PRs, then watch your progress come alive with visual analytics — free on your phone.
