Picture this: you're hitting a PR on your long run, you're five miles in, and you've never felt better. Your legs are moving, your breathing is controlled, and suddenly, you get a cramp in your stomach and you feel it—the call of the wild. In a study of long-distance runners, researchers found that 62% of them had to stop to have a bowel movement during their run. So what is it exactly that causes the "runner's trots", what are the implications for your pelvic floor, and most importantly, what can you do to fix it?