Weight itself cannot truly and objectively reflect whether your weight is normal or not. Of course, many people have used body mass index to measure whether they are obese or not. Body mass index Body mass index, or body mass index, can reflect whether your adult weight is normal or not to some extent. Body mass index (BMI) = weight (kg)÷ height 2 (m) Many experts in the world have said that the ideal BMI range for adults is 2 1-23. However, it cannot be considered that the lower the body mass index value, the thinner it is, and the higher the body mass index value, the fatter it is. Otherwise, it can't explain why some people of the same height and weight look slender and some look bloated. Is anyone really good at "hiding meat"? Ma Jun believes that the amount of fat is the real criterion for judging "fat" or "thin" in our traditional understanding. Interestingly, fat is the least dense human component; This is why a lighter person looks fatter than a heavier person with more developed muscles. Thus, the relationship between weight and fatness is very complicated, and it can't be measured only by the figures in weighing scale or body mass index. Ma Jun feels that this theory is specially designed for different people to customize fitness.