There was an article in the June issue of Fit Yoga, a magazine stacked free in the studio, that I've been checking for online every day. I'm dying to share it. It's called "Taking Care of Business: Here's the poop on keeping your bathroom visits regular and stress-free."
Best article ever, at least for offspring of a gastroenterologist. It has six pages full of photos of two middle-aged (read: time for that colonoscopy) yogis helping one another through a series of bowel-friendly poses. They look so peaceful doing them.
Prose sample: "If you're in the habit of holding it in, you may lose the ability to recognize the signal - a feeling of fullness in the rectum. Waiting too long causes a traffic jam in the colon."