Distance running can get weird. These marathon runners dealt with surprise poop explosions and even broken bones to finish the race strong.

More than 30,000 marathoners partook in the annual run from Hopkinton, Mass. to downtown Boston, with many of them finishing in three, four, five hours or more — and often forgoing a bathroom break.

The Boston Marathon is one the largest and most prestigious marathons in the country. Every year thousands of runners compete in the race. However, this year, one runner had a problem halfway through ...