hi all you strong, fabulous runners. i have a question/challenge: earlier this week i finally broke my 12-min mile on my weekly long run (i'm training for a 1/2 marathon in the spring.) i was pushing hard for five miles, but it felt great. hard but great, kwim? anyway, immediately (and i mean IMMEDIATELY) afterwards, the colon was cramping. i had to cut my stretching to make it to the bathroom in time. i continued experiencing painful sphinctor spasms for the better part of my commute home (almost 40 minutes.) eventually it let up and i was completely fine, but whoa nelly. does anyone else get them? i'd heard about them but didn't think i'd ever run hard enough to experience it firsthand. what in the name of sweet buttered toast do you do to keep it from happening?
thanks!!!

) on what sort of symptoms you get with longer and/or harder runs.
)