the_dunk_tank
It's the dunk tank.
This is where you come to post big-brained hot takes by chuds, libs, or even fellow leftists, and tear them to itty-bitty pieces with precision dunkstrikes.
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How do they calculate the body fat? Do they submerge him in a ~~tube~~ graduated cylinder to see how much water he has displaced to get his density?
There's some methods of measuring. DEXA is generally the most accurate and common but what you describe is also a method of doing it. In this case though he just simply made it up
https://en.wikipedia.org/wiki/Body_fat_percentage
Can I do this in my bathtub/a horse trough?