How Accurate Is Your Smartwatch VO2 Max Estimate? 

Pretty impressive honestly

I don’t believe taking a single vo2max test is going to be beneficial for most people. From my perspective, it should be used to measure how much your performance has increased from training block to training block, year over year. I plan to do another in the future to see how much I can improve.

I do not use a Garmin, just the Apple Watch

I think almost anyone that rides their bike more than 10 hours a week will fit into at least the excellent category