And no, you can't just make them relax or go with the flow, no matter how hard you try.
Blame your brain. "There's a lot of coordination in your brain communicating with your anal sphincter and rectum to have a bowel movement," Sam says. "When you're traveling, you may not be relaxed enough in your new environment to have a bowel movement. The system is just off."
Do this to poop better: As we've already covered, drink a lot of water, eat a lot of fruits and veggies, get your exercise. And if after doing all that you still can't poop after three or four days and you're beginning to feel crampy and bloated and miserable, Sam suggests a safe laxative called MiraLAX. "In those situations where you're starting to get the pain, then you might want to try to take the laxative," she says.