windschatten wrote:
Well, current Science says you don't.
Regarding bowel movement:
For me actually having some coffee and easy to digest solids seems to speed that up, so I do not have to find a port-a-potty after a mile or two.
No breakfast: Guaranteed bowel movement mid workout.
That does vary with dinner content though, and everybody is different anyways.
Poor word choice on my part; of course I
can train without something. My body physically has enough glycogen to do it. In my experience, my workouts are dull. I swim better, in particular, with about 200 calories of something solid. I run better with a quick gel. Early morning long rides start with a Clif Bar and follow with gel to finish.