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So I've always wondered what about running makes you have to go to the bathroom? Why is it that it seems to accelerate the downward progress of any ... you know ... Or maybe I'm the only one this happens to?

I'm asking seriously, I want to know why!

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21  
This is a really crappy question... :-p –  JasCav Mar 7 '11 at 21:48
    
A good reason to do treadmill running! –  Chris S Nov 14 '11 at 19:33
    
As someone who is working up to running more consistently, I sure am glad I stumbled onto this question. –  Paperjam Feb 27 '12 at 10:31
    
I have the same problem. I think personally it's healthy though, because I am lactose intolerant (hard core) and I have a very hard time going to the bathroom sometimes, ever since I have been running (and eating right for me) I have been way more regular, maybe too regular, and I feel great! –  user3373 Apr 23 '12 at 11:46

3 Answers 3

up vote 36 down vote accepted

You're not the only one this happens to, exercise is one of the best natural laxatives.

What I found interesting is that any physical activity can help prevent constipation, because it isn't just the physical rebounding of the gut from running which loosens things up, the colon also gets stimulated so it can both absorb the nutrients you'll need while exercising and expel waste more efficiently. So, any exercise will actually have a laxative effect.

Mayo Clinic: Constipation

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In my experience, running has a uniquely strong effect that goes way beyond the laxative effect of exercise generally –  David Mar 27 '11 at 15:10
    
Heavy squats. If you haven't been to the bathroom beforehand, well, after a set or two, the rest time gets a bit longer... –  Markus Wall Apr 23 '12 at 13:36

"Runner's trots" or an increase in the need to hit the port-a-john during or after a run is most often attributed to a general decrease in blood flow to the intestines, altered hormones and absorption levels, and “jostling” of the gut (think about what happens to a ketchup bottle when you turn it upside down and smack it).

Here's a link to an short article that goes a bit more in depth.

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It may be a combination of running and your diet. Generally, you should stay away from a high fiber and high fat diet 24 hours before a long run. I also recommend holding back on as much fiber and fat as you can until you complete a regular run for the day.

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