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BMI measurements do have some signal for endurance athletes.

People who win running competitions are quite tightly grouped BMI-wise.

And for running I guess that makes sense, a kg of muscle weights as much as a kg of fat. Even if that kg of muscle is a lot healthier than the kg of fat.

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Yes I should have clarified: I think the BMI levels (underweight, normal etc.), that is the "wording" cannot necessarily be applied to athletes (edit: and could be misleading for people and their self-concept when their weight is perfectly fine). You are right of course that the top runners in a competition likely stand out BMI-wise from the rest.

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