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Mummelmann said:
The idea is great, but BMI really is highly flawed. Using just the weight could work just as well, you can see for yourself whether or not your body fat is too high. If I stepped on the board, it'd tell me I was obese, which I'm not, having a body fat % below average but muscle % above average.

 You have that option actually.  You can set your own goals and set yoruself to gain weight if you'd like.