The only real valid measurement is body fat percentage. Everything else (waist bmi etc) is a secondary measurement with different levels of correlation. If you

The only real valid measurement is body fat percentage. Everything else (waist bmi etc) is a secondary measurement with different levels of correlation. If you don’t measure the one thing that matters you end up screwing over anyone who falls outside of the expected correlation. As a general policy making tool it’s ok but if every individual is made to conform the lives of the outlier are unfairly impacted. Of course it’s Japan and they don’t care about outliers but still sucks