Modernizing the Fitbit Developer Experience.
The Fitbit Web APIs are moving to a new, scalable infrastructure. We will be deprecating the legacy Fitbit Web API in September 2026. To ensure uninterrupted data continuity for your users, you will need to migrate your applications. Detailed migration guides are live on the Google Health API developer site.
Cardio Fitness Score (VO2 Max)
chevron down
 

-

Cardio Fitness Score (VO2 Max)

The Cardio Fitness Score (also known as VO2 Max) endpoints are used for querying the maximum or optimum rate at which the user’s heart, lungs, and muscles can effectively use oxygen during exercise.

Developers can use the following API endpoints when integrating the VO2 Max data type: