I am a healthy 25 yo female, 5'9'',135 lbs. I work out regularly. I started running about 8 months ago, but in the last month several times during running I have noticed the urge for a bowel movement. I continue running even though I need to use the restroom, and then afterwards I go to the restroom. It has happened 4 times now, that after running my stool has flecks of blood and then bright red on the toilet paper. I have no other symptoms of abdominal pain, and I have not noticed this in my stools at any other time.