Squatting is also believed to help with digestion: As the pelvis descends, you encourage the downward flowing energy of apana vayu, which, according to some yoga traditions, helps the body eliminate waste and clear the mind. (yogajournal.com)
The samana vayu unites the upward energy of prana and the downward energy of apana. (mindbodygreen.com)
Apana energy nourishes the organs of digestion and reproduction, it is situated in the pelvic floor, and its energy nourishes the organs of digestion and reproduction. (mindbodygreen.com)