I have been running very steadily for years but had a drop recently, partly covid, partly move to other continent induced. So I am starting again, albeit from a very low level. I have now been running again for 2 plus weeks, and am beginning to feel human again after my runs, even though I am still much slower than I used to be. Point is though, my fitness is definitely going up, not down. Yet Connect keeps telling me my fitness is going down, and basically has been giving me a vo2max worthy of a chain-smoker (37 when it used to be well into the mid 40s). I did a rule of thumb estimate manually today and ended up with 43. So what is this? Should I just ignore the Connect values? They cannot be right, at the very least regarding my fitness trend - I'm not at marathon level for sure, but I'm way beyond where I was two weeks ago.