Have you ever had a sloshing sensation in your stomach while exercising? Like you can feel the water you drank sloshing around. I had a problem with that a couple of months ago. I was drinking water while working out instead of Diet Coke. A couple of times it got bad enough that I had to stop exercising.
I never had that problem when I drank Diet Coke. I didn't know what was going on. I thought I wasn't waiting long enough between my last meal and exercising.
After a few days I switched back to Diet Coke because supposedly caffeine encourages your body to burn fat for energy rather than using the glycogen stores in your muscles. I haven't reviewed the research on that so I don't put too much faith in that theory. But I do prefer drinking something other than water while exercising so I stuck with the Diet Coke.
Apparently the sloshing sensation is caused by drinking water without enough sodium present. Your body doesn't absorb fluids readily without sodium, so drinking water alone can cause the sloshing sensation. That explains why I've never had that problem when I drink Diet Coke.
I heard this while listening to archives of the Active.com Sports You Do Show.