Lots of runners have this problem. Here's on fix from Runners World....
A sudden midrun need to hit a bathroom CULPRIT The gut receives less blood midrun, causing poor GI function—earning this malady its nickname, the "runner's trots." The longer your run, the more likely you'll experience it. FOOD FIX Avoid high-fiber foods 24 hours before running. Pass on coffee (it stimulates intestinal motion). Dehydration and too many midrun carbs worsen the problem; don't exceed 30 to 60 grams of carbs per hour.
When I am part of the way through my training run, I start needing a bathroom break desperately. It makes the rest of my run very uncomfortable. Why do my bowels start to move so forcefully at this point & what can be done about it? Any suggestions?
P.S. I run outside, so I can't just take a break as there is no where to take one.
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