Science behind squatting
Comparison of straining during defecation in three positions: results and implications for human health
https://pubmed.ncbi.nlm.nih.gov/12870773/
"In conclusion, the present study confirmed that sensation of satisfactory bowel emptying in sitting defecation posture necessitates excessive expulsive effort compared to the squatting posture."
Implementation of a Defecation Posture Modification Device
"Conclusions: DPMDs positively influenced BM (Bowel Movement) duration, straining patterns, and complete evacuation of bowels in this study."
Influence of Body Position on Defecation in Humans
https://cdn.shopify.com/s/files/1/0260/7366/1474/files/Influence_of_Body_Position.pdf?2141
"Conclusion: The results of the present study suggest that the greater the hip flexion achieved by squatting, the straighter the rectoanal canal will be, and accordingly, less strain will be required for defecation."