“The body mass index has long been criticized as a flawed indicator of health. A replacement has been gaining support: the body roundness index.” Article unfortunately doesn’t give the freaking formula for chrissakes; it’s “364.2 − 365.5 × √(1 − [waist circumference in centimeters / 2π]2 / [0.5 × height in centimeters]2), according to the formula developed by Thomas et al.10”
Well it incentivises neither.
I’ll admit I was disappointed that I put on weight once I worked out a bit, but there’s still plenty of podge to go before I can blame BMI for me being slightly overweight.
It incentivizes fat because it is much lighter than muscle.