The Rack Athletic Performance Center

1824 Briarwood Industrial Crt. NE STE 2
Atlanta, GA 30329


Mon - Fri: 5:30am-7:00pm

Sat - Sun: 9:00am-3:00pm


$20 Day Pass

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Hydrostatic Weighing

March 6, 2018

Hydrostatic weighing. Underwater weighing. A dunk tank. They’re all the same thing. This post is to help you understand what exactly hydrostatic weighing is, what it can do for you, and then give you a chance to participate in it!


What exactly is hydrostatic weighing?


Hydrostatic weighing measures a person’s total body density using Archimedes’ Principle of Displacement. If you aren't a physics buff, don't worry. Hydro weighing simply compares fat mass to lean mass. If a person has more body fat, they will weigh less under water and be more buoyant. Someone with more lean muscle will weigh more underwater and tend to sink.


It is done by totally submerging yourself in water for a few seconds while you blow out the air in your lungs underwater. You are in complete control and can come up out of the water at anytime. Working out and drinking water will not affect the test results.


Why would someone do this?


An individual could choose to do hydrostatic weighing for multiple reasons. Some are listed below:


-Underwater weighing is price effective and easily affordable for individuals, whereas Bod Pods and DEXA scans can be fairly expensive.

-Hydrostatic weighing is easy and convenient to use, especially when they come to you. However, if you are claustrophobic or scared of water, it may not be the best choice for you.

-Hydrostatic weighing has been used in multiple studies to analyze body fat percentage for its accuracy.

- Information gained by testing can help them with fitness goals or just to give you knowledge of where your body stands.

-Testing takes roughly 10 minutes


What do you need so you can participate? Are there limitations?

-a towel

-a swimsuit


It’s that simple, convenient and cheap!


There are no limitations unless you are claustrophobic or scared to be under water. Participants of all ages and sizes may participate in this as individuals from youth to professional athletes utilize this method to get a detailed body analysis.


Ready to take the plunge??


The Rack APC will have a hydrostatic weighing tank available for testing on the days of April 9th and April 10th . On April 9th, testing will begin at 2pm and on April 10th, testing will begin at 7am. A sign up sheet will be available starting the week of March 5th for members to pick times to participate. If you are not a current member or If you have questions, please email me at!



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