Samsung added new functions to the Galaxy Fit 3, but some functions are still missing from the band. If you are looking for a VO2 Max score on the smart band, then currently it is not possible to check it. The essential VO2 Max feature is not available on Galaxy Fit 3. There is a chance Samsung will add it later in future firmware upgrades. This function can be added over the air with software updates, so we should wait for it. In the case of Galaxy Watch 4, it was later added to the smartwatch.
I know, the VO2 Max score is a vital feature for a fitness enthusiast person. It tells you how much oxygen you have earned while doing exercises. It gives the final score based on your age, where above 60 score is perfect. In a Samsung Health for Galaxy Watch, the feature has been added to the running activity. It will show the score when you run for 4 km and 10 minutes. It also needs a good GPS signal to track your movement and location. Samsung should enable VO2 Max for Galaxy Fit 3 as soon as possible.