There is no answer to this one. It has stopped me running at stupid 'o clock in the morning and I now run midday or mid-afternoon. That helped, but not always. The best explanation I was given is that if your body is running under stress i.e. a 20 mile training run or getting up at stupid 'o clock your body does everything that it can to protect the kidneys and other vital functions, and the last stages of digesting food falls into the 'not vital' category, so the body short circuits it and gets it out of the way. If you run fast and long distances it will happen. Many famous runners own up to suffering from it, so we're in honoured company.
I have to agree with Exhausted. I've tried every conceivable option to alleviate this problem and I strongly believe it's just how my body deals with trauma/stress/exertion/heat. I know plenty of others who suffer with it too. My solution is to carry Imodium in my pocket and take them mid-run if I feel overwhelming urges coming on (and I'm not in a position to find a proper pit stop). Not ideal, but Imodium doesn't bung you up, it temporarily slows down muscle contractions. Thankfully, I'm finding I only really need them in long race conditions, as my body seems to have adapted to the stresses of 'normal' running.
I’ve always been fairly slight, but with a solid ‘sprinter’s arse’. Since I started distance running, I now have a soft ‘marathoner’s arse’. Boobs disappeared years ago, so can’t blame running for that
Wenty, lad – just do it. Embrace the pong. Same at DT – flannel, baby wipes and some spray and you’ll be reet