Only one running watch brand admits its VO2 Max and recovery estimates aren't perfect

Smartwatches take weeks to give you accurate health and fitness data, and even then, they're not always right. One brand lets you take matters into your own hands, and it's all the better for it.

source https://www.androidcentral.com/wearables/why-i-love-polars-manual-vo2-max-and-recovery-tests