This trial uses a device called Fecobionics, which mimics normal stool, to measure internal pressures and movements in the rectum and anus. It targets patients with fecal incontinence to better understand muscle function during defecation. The goal is to improve diagnosis and treatment by providing detailed insights into how these muscles work. Fecobionics is a simulated stool device developed to replace several current tests of anorectal function and has been used in both animal and human studies to assess defecation patterns.