Our expert says:
He might be drinking too much on the run? That happens to quite a lot of people. Or else it might be the nature of what he is drinking - perhaps he is drinking coke or something sweet and it's affecting his stomach. You must remember that during exercise, your body sends the blood to the muscles, not the stomach, so foods and drinks that you normally can handle are suddenly too sweet or rich and can cause this problem.
That's one option. The second is a form of motion sickness, which can be treated using the same tablets they give people who get sea-sick. He might try that out as a second option.
The first is to play around with the diet, both before and during his runs. Maybe it's the quantity he drinks, maybe it's the type of liquid, or even the food he eats before he runs. Difficult to answer, other than to suggest these options, which I hope help.
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