Using the BMI as a standard measurement of body fat isn't the best choice any more. It can't differentiate between muscle and fat or account for how either is distributed. That all means,sedentary people or short people have an unfair advantage over athletes and those who are tall.
The Bod Pod technology is fundamentally the same as underwater (hydrostatic) weighing, but uses air instead of water. The Bod Pod measures the volume of air a person's body displaces while sitting inside a comfortable chamber, rather than measuring how much water his or her body displaces when dunked in a tank. By using air instead of water, the Bod Pod offers a fast, safe, and easy-to-use tool for measuring body composition, without sacrificing accuracy.
Since it is based on the same whole-body measurement principle as hydrostatic weighing, the Bod Pod first measures the subject's mass and volume. From these measurements, whole-body density is determined. Using this data, body fat and lean mass can then be calculated.
The Bod Pod is now the gold standard for body fat measurement.