I got painful and cramps after 11K. Slowing down did not help. Walking did not help. I had to walk slowly or stop altogether. The pain is on the right of my stomach. I need to understand this phenomenon because its a major threat. At some point I seriously considered appendicitis.
I have discovered the possible cause of my cramps (in order of decreasing likelihood):
1. Agressive use of roller the previous day.
2. Improper breathing.
3. Inadequate warm up before the run.
4. Taking of water a few minutes into the run.
Thats it. I will look into it.