Talking about our excretory system may sound immature, but according to the Mayo Clinic many people in the world don’t have a safe way to do their business. And by age 50, about half of American adults have experienced hemorrhoid symptoms.

When we’re sitting this bend, called the anorectal angle, is kinked which puts upward pressure on the rectum and keeps the feces inside. This creates the need to STRAIN in order to eliminate. Compare sitting on the toilet to a kinked garden hose, it just doesn’t work properly. In a squatting posture the bend straightens out and defecation becomes easier.

Assuming the squat position is the natural way to achieve easier and more complete elimination. Research has shown that in some people, the kink is completely gone while squatting. 

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Source of this subject SquattyPotty