When I Jog At A Moderate Pace I Seem Have

When I jog at a moderate pace I seem have to move my bowels. Sometimes I have an accident. It happens most frequently when I run/jog but occasionally I do have sudden urge to go which is NOT directly related to the food I eat. I try taking Metamucil when I can. Why is this happening and could it be something more serious. PS I got a colonoscopy last April 5 and all was good. I did not have any of these sy mptoms btw after colonoscopy for about 2 monthys but then it started happening again. Can you shed some light on this very embarrassing problem?