Do you want “fit” people as based on BMI or do you want “fit” based on cardiovascular fitness? Or do you want just the young, fit, and no comorbidities population data?
Being fat and sedentary is definitely a risk factor. But it’s obtuse and unrealistic to say, ignore everything else and just get skinny.
I’m in favor of keeping the focus on the simple, easy, one step process of reducing your risk in TWO weeks.
Yes, add fitness to the list but it is in no way comparable to a onetime shot.
I’ve spent the last 15 years encouraging people to lose weight, eat right, exercise regularly, live healthy lifestyle to avoid impending disaster. I do it for a living.
I just realize that focusing on that at the expense of vaccination focus is folly. Moving from a BMI of 35 to a BMI of 30 is a big ask. Moving from 30 to 27 is similar. It takes months. And is only successful a small minority of the time. And is unproven as a defense against Covid than is vaccination.