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I appreciate the result, but this test is heavily biased against certain builds. I weigh about 280 pounds, and the distribution of mass and the girth of my trunk basically make it impossible to balance while sitting or standing up without using a hand for support. This is regardless of how strong or agile I might be, and despite my otherwise fine cardiovascular health. I'm not sure the researchers accounted for builds like mine.

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Not really sure how this follows.

The lowest scoring group in this study also happened to have the highest mean BMI. Obesity is generally considered to be one of the strongest predictors of life expectancy and cardiovascular health (or lack thereof). Being strong or agile doesn't decrease the damage to the cardiovascular system caused by obesity.

This is very similar to BMI. It is really a general measure that's broadly useful at the population level, but on the individual level can be wildly off.

This isn't to downplay the usefulness of this measure though! It's simple, fast, non-invasive, relatively safe etc

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