[tluyben2]

Since the watchOS 9 update, I am the most unhealthy person ever. I saw on Reddit people have the same results but it really went mental; I walked into the local clinic for a vo2max as the watch keeps warning me; it (the watch) was 15 points off on the negative side, and so was my blood oxygen; 10% off on the wrong side. It’s pretty scary for a software update…

[odysseus]

As a counterpoint, I saw something similar happen after upgrading to watchOS 8 for 7 months, but then I somehow got my vo2max to go back up by losing 5 pounds in 1 month and eating healthier.

[tluyben2]

Well, so far it made me more healthy as I am trying to change it but it definitely is off from the real numbers as I did an actual vo2max at the clinic here.