Academic paper "Comparison of straining during defecation in three positions: results and implications for human health" states that "sensation of satisfactory bowel emptying in sitting defecation posture necessitates excessive expulsive effort compared to the squatting posture". Here is my Defecation Position Sign for Visitors.
My professional artist daughter Véronique has brought to my attention "Squatty Slides": The first platform sandals with a retractable base that helps put your legs in the optimal position for doing your business.
When I went cross-country skiing at ambient temperature of +1 C, snow was sticking to the skis. It is too bad that there is no toilet around to take advantage of the ad hoc platform thanks to accumulated snow.