I was set to have an excellent 10M run. Goal was sub 70 min. I ended up doing 7.5 in 75 minutes.
The first three miles flew by and was enjoying the great spring temps. And yet, somewhere around mile two I noticed I wasn't focusing on my breathing or my tempo. Instead, I was focusing on one thing in particular: bowel lock-down. After three and a half amazing miles of running, I had to stop and walk or else very bad things were going to happen.
Longest four miles ever. The drawback of running in the wilderness. At one point my stomach growled to loudly that I scared a bear.
You may not wish to know such things...but all runners have to deal with this at some point. It is an inevitable as a Facts of Life Reunion.