I set out to run 6 miles. No problem. I wasn't even worried about it. Last time I tried to run 5 I got a side cramp. I ate breakfast that morning before the run. This time, I didn't eat breakfast. I got a HUGE side cramp. I still went 6 miles, but I had to slow my pace extremely on Mile 3 and by Miles 5 & 6 I was walking. I have GOT to figure out why this is happening.