Health and fitness correlate but are different things. VO2max is more about fitness than about health.
Also, looking at https://en.wikipedia.org/wiki/VO2_max#Reference_values, 30 is about average for men in their 40s/50s, which, form a quick google, I estimate is the author’s age range.
And the average man is his 40s or 50s is in...not especially good aerobic shape.
Health and fitness correlate but are different things. VO2max is more about fitness than about health.
Also, looking at https://en.wikipedia.org/wiki/VO2_max#Reference_values, 30 is about average for men in their 40s/50s, which, form a quick google, I estimate is the author’s age range.