BIA measurement (also known as body composition analysis) is a method of assessing a person’s body composition.
By sending a weak electric current through the body and measuring the resistance or impedance, the BIA method can determine various body components such as water, muscle mass and fat mass. This gives you a detailed overview of your individual body composition.
Bioelectrical impedance analysis is often used in the fitness and health industry to track the progress of exercise and nutrition programs and to assess health risks associated with obesity.

Overview of a BIA measurement evaluation