Health & fitness glossary
Plain-language definitions of the metrics Vita tracks — HRV, VO₂max, resting heart rate, sleep debt and biological age — and how each one shapes your recovery and Body Age.
What is HRV?
What is HRV (heart-rate variability), and what's a good number?
What is VO₂max?
What is VO₂max, and why does it matter for longevity?
Resting heart rate
What is a good resting heart rate?
Sleep debt
What is sleep debt, and can you pay it back?
Biological age
What is biological age, and how is it different from your real age?