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jackc
I think it's legit, but I'm not sure how beneficial it is.
Partner has paid for one of the similar services, and has a bunch of interesting but ultimately (imho) not too useful information.
I think the vast majority of the population wont reach the point where they're anywhere close to their god given limitations, so to be concerned that you'll never get a VO2 Max of 80 is about as useful as wondering what you'll spend your 10th million on.
I think you can get to being excellent at your chosen sport with sensible and dedicated training long before you need to worry about what your hard coded limits are.