Air Displacement Plethysmography (Bod Pod)

Air displacement plethysmography (ADP), which is similar to hydrostatic weighing, estimates your body fat percentage based on the density of your body. ADP, however, substitutes air for water.

This device can estimate your body's density based on the link between air pressure and volume. While the air pressure inside the egg-shaped chamber is changed, you sit inside it for a while. You must test while dressed in skin-tight clothes or a swimming suit to get precise measurements. Testing is rapid, safe, and highly accurate; an analysis is finished in approximately 10 minutes. But it’s typically only available at certain medical, research or fitness facilities.